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Finding the Fourth Proportional to 11,500.61, 15,864.42 and 7,915.14

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Solution

The fourth proportional to 11,500.61, 15,864.42 and 7,915.14 is: 10,918.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,500.61 : 15,864.42 = 7,915.14 : x
  2. Step 2: Convert to fraction form
    11,500.61/15,864.42 = 7,915.14/x
  3. Step 3: Cross multiply
    11,500.61x = 15,864.42 × 7,915.14
  4. Step 4: Simplify right side
    11,500.61x = 125,569,135.00
  5. Step 5: Solve for x
    x = 125,569,135.00/11,500.61
  6. Step 6: Final answer
    x = 10,918.48

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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.