Home / 13,116.18-18,099.80-7,147.72

Finding the Fourth Proportional to 13,116.18, 18,099.80 and 7,147.72

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Solution

The fourth proportional to 13,116.18, 18,099.80 and 7,147.72 is: 9,863.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,116.18 : 18,099.80 = 7,147.72 : x
  2. Step 2: Convert to fraction form
    13,116.18/18,099.80 = 7,147.72/x
  3. Step 3: Cross multiply
    13,116.18x = 18,099.80 × 7,147.72
  4. Step 4: Simplify right side
    13,116.18x = 129,372,334.02
  5. Step 5: Solve for x
    x = 129,372,334.02/13,116.18
  6. Step 6: Final answer
    x = 9,863.57

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Double scale
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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.