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Finding the Fourth Proportional to 99,787.80, 137,722.30 and 62,074.20

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Solution

The fourth proportional to 99,787.80, 137,722.30 and 62,074.20 is: 85,671.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,787.80 : 137,722.30 = 62,074.20 : x
  2. Step 2: Convert to fraction form
    99,787.80/137,722.30 = 62,074.20/x
  3. Step 3: Cross multiply
    99,787.80x = 137,722.30 × 62,074.20
  4. Step 4: Simplify right side
    99,787.80x = 8,549,001,594.66
  5. Step 5: Solve for x
    x = 8,549,001,594.66/99,787.80
  6. Step 6: Final answer
    x = 85,671.81

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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.