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Finding the Fourth Proportional to 83,129.80, 124,809.90 and 65,619.40

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Solution

The fourth proportional to 83,129.80, 124,809.90 and 65,619.40 is: 98,520.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,129.80 : 124,809.90 = 65,619.40 : x
  2. Step 2: Convert to fraction form
    83,129.80/124,809.90 = 65,619.40/x
  3. Step 3: Cross multiply
    83,129.80x = 124,809.90 × 65,619.40
  4. Step 4: Simplify right side
    83,129.80x = 8,189,950,752.06
  5. Step 5: Solve for x
    x = 8,189,950,752.06/83,129.80
  6. Step 6: Final answer
    x = 98,520.03

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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.