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Finding the Fourth Proportional to 71,590.20, 98,793.90 and 39,761.40

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Solution

The fourth proportional to 71,590.20, 98,793.90 and 39,761.40 is: 54,870.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,590.20 : 98,793.90 = 39,761.40 : x
  2. Step 2: Convert to fraction form
    71,590.20/98,793.90 = 39,761.40/x
  3. Step 3: Cross multiply
    71,590.20x = 98,793.90 × 39,761.40
  4. Step 4: Simplify right side
    71,590.20x = 3,928,183,775.46
  5. Step 5: Solve for x
    x = 3,928,183,775.46/71,590.20
  6. Step 6: Final answer
    x = 54,870.41

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.