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Finding the Fourth Proportional to 78,614.48, 108,553.29 and 72,916.16

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Solution

The fourth proportional to 78,614.48, 108,553.29 and 72,916.16 is: 100,684.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,614.48 : 108,553.29 = 72,916.16 : x
  2. Step 2: Convert to fraction form
    78,614.48/108,553.29 = 72,916.16/x
  3. Step 3: Cross multiply
    78,614.48x = 108,553.29 × 72,916.16
  4. Step 4: Simplify right side
    78,614.48x = 7,915,289,062.17
  5. Step 5: Solve for x
    x = 7,915,289,062.17/78,614.48
  6. Step 6: Final answer
    x = 100,684.87

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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.