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Finding the Fourth Proportional to 78,412.52, 117,503.93 and 38,890.73

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Solution

The fourth proportional to 78,412.52, 117,503.93 and 38,890.73 is: 58,279.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,412.52 : 117,503.93 = 38,890.73 : x
  2. Step 2: Convert to fraction form
    78,412.52/117,503.93 = 38,890.73/x
  3. Step 3: Cross multiply
    78,412.52x = 117,503.93 × 38,890.73
  4. Step 4: Simplify right side
    78,412.52x = 4,569,814,006.56
  5. Step 5: Solve for x
    x = 4,569,814,006.56/78,412.52
  6. Step 6: Final answer
    x = 58,279.14

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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.