Home / 13,211.10-18,217.71-9,230.76

Finding the Fourth Proportional to 13,211.10, 18,217.71 and 9,230.76

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Solution

The fourth proportional to 13,211.10, 18,217.71 and 9,230.76 is: 12,728.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,211.10 : 18,217.71 = 9,230.76 : x
  2. Step 2: Convert to fraction form
    13,211.10/18,217.71 = 9,230.76/x
  3. Step 3: Cross multiply
    13,211.10x = 18,217.71 × 9,230.76
  4. Step 4: Simplify right side
    13,211.10x = 168,163,308.76
  5. Step 5: Solve for x
    x = 168,163,308.76/13,211.10
  6. Step 6: Final answer
    x = 12,728.94

Related Problems

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Half scale
Find fourth proportional to 26,422.20, 36,435.42 and 18,461.52
Double scale
Find fourth proportional to 13,212.10, 18,219.09 and 9,231.76
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.