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Finding the Fourth Proportional to 72,755.20, 100,391.16 and 40,931.92

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Solution

The fourth proportional to 72,755.20, 100,391.16 and 40,931.92 is: 56,479.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,755.20 : 100,391.16 = 40,931.92 : x
  2. Step 2: Convert to fraction form
    72,755.20/100,391.16 = 40,931.92/x
  3. Step 3: Cross multiply
    72,755.20x = 100,391.16 × 40,931.92
  4. Step 4: Simplify right side
    72,755.20x = 4,109,202,929.83
  5. Step 5: Solve for x
    x = 4,109,202,929.83/72,755.20
  6. Step 6: Final answer
    x = 56,479.85

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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.