Home / 13,121.58-18,108.08-7,153.55

Finding the Fourth Proportional to 13,121.58, 18,108.08 and 7,153.55

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Solution

The fourth proportional to 13,121.58, 18,108.08 and 7,153.55 is: 9,872.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,121.58 : 18,108.08 = 7,153.55 : x
  2. Step 2: Convert to fraction form
    13,121.58/18,108.08 = 7,153.55/x
  3. Step 3: Cross multiply
    13,121.58x = 18,108.08 × 7,153.55
  4. Step 4: Simplify right side
    13,121.58x = 129,536,929.38
  5. Step 5: Solve for x
    x = 129,536,929.38/13,121.58
  6. Step 6: Final answer
    x = 9,872.05

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Half scale
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Double scale
Find fourth proportional to 13,122.58, 18,109.46 and 7,154.55
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.