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Finding the Fourth Proportional to 83,172.80, 124,564.80 and 81,502.40

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Solution

The fourth proportional to 83,172.80, 124,564.80 and 81,502.40 is: 122,063.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,172.80 : 124,564.80 = 81,502.40 : x
  2. Step 2: Convert to fraction form
    83,172.80/124,564.80 = 81,502.40/x
  3. Step 3: Cross multiply
    83,172.80x = 124,564.80 × 81,502.40
  4. Step 4: Simplify right side
    83,172.80x = 10,152,330,155.52
  5. Step 5: Solve for x
    x = 10,152,330,155.52/83,172.80
  6. Step 6: Final answer
    x = 122,063.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.