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Finding the Fourth Proportional to 81,475.40, 122,115.90 and 73,116.20

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Solution

The fourth proportional to 81,475.40, 122,115.90 and 73,116.20 is: 109,587.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,475.40 : 122,115.90 = 73,116.20 : x
  2. Step 2: Convert to fraction form
    81,475.40/122,115.90 = 73,116.20/x
  3. Step 3: Cross multiply
    81,475.40x = 122,115.90 × 73,116.20
  4. Step 4: Simplify right side
    81,475.40x = 8,928,650,567.58
  5. Step 5: Solve for x
    x = 8,928,650,567.58/81,475.40
  6. Step 6: Final answer
    x = 109,587.07

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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.