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Finding the Fourth Proportional to 83,999.80, 125,999.70 and 31,402.45

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Solution

The fourth proportional to 83,999.80, 125,999.70 and 31,402.45 is: 47,103.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,999.80 : 125,999.70 = 31,402.45 : x
  2. Step 2: Convert to fraction form
    83,999.80/125,999.70 = 31,402.45/x
  3. Step 3: Cross multiply
    83,999.80x = 125,999.70 × 31,402.45
  4. Step 4: Simplify right side
    83,999.80x = 3,956,699,279.27
  5. Step 5: Solve for x
    x = 3,956,699,279.27/83,999.80
  6. Step 6: Final answer
    x = 47,103.68

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1.5x scale

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.