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Finding the Fourth Proportional to 71,781.60, 99,045.20 and 39,950.48

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Solution

The fourth proportional to 71,781.60, 99,045.20 and 39,950.48 is: 55,124.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,781.60 : 99,045.20 = 39,950.48 : x
  2. Step 2: Convert to fraction form
    71,781.60/99,045.20 = 39,950.48/x
  3. Step 3: Cross multiply
    71,781.60x = 99,045.20 × 39,950.48
  4. Step 4: Simplify right side
    71,781.60x = 3,956,903,281.70
  5. Step 5: Solve for x
    x = 3,956,903,281.70/71,781.60
  6. Step 6: Final answer
    x = 55,124.20

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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.