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Finding the Fourth Proportional to 72,805.76, 100,451.84 and 40,972.80

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Solution

The fourth proportional to 72,805.76, 100,451.84 and 40,972.80 is: 56,531.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,805.76 : 100,451.84 = 40,972.80 : x
  2. Step 2: Convert to fraction form
    72,805.76/100,451.84 = 40,972.80/x
  3. Step 3: Cross multiply
    72,805.76x = 100,451.84 × 40,972.80
  4. Step 4: Simplify right side
    72,805.76x = 4,115,793,149.95
  5. Step 5: Solve for x
    x = 4,115,793,149.95/72,805.76
  6. Step 6: Final answer
    x = 56,531.15

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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.