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Finding the Fourth Proportional to 76,910.70, 115,279.65 and 39,456.30

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Solution

The fourth proportional to 76,910.70, 115,279.65 and 39,456.30 is: 59,140.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,910.70 : 115,279.65 = 39,456.30 : x
  2. Step 2: Convert to fraction form
    76,910.70/115,279.65 = 39,456.30/x
  3. Step 3: Cross multiply
    76,910.70x = 115,279.65 × 39,456.30
  4. Step 4: Simplify right side
    76,910.70x = 4,548,508,454.30
  5. Step 5: Solve for x
    x = 4,548,508,454.30/76,910.70
  6. Step 6: Final answer
    x = 59,140.13

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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.