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Finding the Fourth Proportional to 72,909.97, 109,361.29 and 28,544.86

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Solution

The fourth proportional to 72,909.97, 109,361.29 and 28,544.86 is: 42,815.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,909.97 : 109,361.29 = 28,544.86 : x
  2. Step 2: Convert to fraction form
    72,909.97/109,361.29 = 28,544.86/x
  3. Step 3: Cross multiply
    72,909.97x = 109,361.29 × 28,544.86
  4. Step 4: Simplify right side
    72,909.97x = 3,121,702,216.17
  5. Step 5: Solve for x
    x = 3,121,702,216.17/72,909.97
  6. Step 6: Final answer
    x = 42,815.85

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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.