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Finding the Fourth Proportional to 83,209.92, 124,813.72 and 77,890.90

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Solution

The fourth proportional to 83,209.92, 124,813.72 and 77,890.90 is: 116,835.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,209.92 : 124,813.72 = 77,890.90 : x
  2. Step 2: Convert to fraction form
    83,209.92/124,813.72 = 77,890.90/x
  3. Step 3: Cross multiply
    83,209.92x = 124,813.72 × 77,890.90
  4. Step 4: Simplify right side
    83,209.92x = 9,721,852,983.15
  5. Step 5: Solve for x
    x = 9,721,852,983.15/83,209.92
  6. Step 6: Final answer
    x = 116,835.26

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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.