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Finding the Fourth Proportional to 72,318.32, 99,787.41 and 45,441.80

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Solution

The fourth proportional to 72,318.32, 99,787.41 and 45,441.80 is: 62,702.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,318.32 : 99,787.41 = 45,441.80 : x
  2. Step 2: Convert to fraction form
    72,318.32/99,787.41 = 45,441.80/x
  3. Step 3: Cross multiply
    72,318.32x = 99,787.41 × 45,441.80
  4. Step 4: Simplify right side
    72,318.32x = 4,534,519,527.74
  5. Step 5: Solve for x
    x = 4,534,519,527.74/72,318.32
  6. Step 6: Final answer
    x = 62,702.22

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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.