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Finding the Fourth Proportional to 81,165.90, 121,530.15 and 63,669.90

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Solution

The fourth proportional to 81,165.90, 121,530.15 and 63,669.90 is: 95,333.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,165.90 : 121,530.15 = 63,669.90 : x
  2. Step 2: Convert to fraction form
    81,165.90/121,530.15 = 63,669.90/x
  3. Step 3: Cross multiply
    81,165.90x = 121,530.15 × 63,669.90
  4. Step 4: Simplify right side
    81,165.90x = 7,737,812,497.49
  5. Step 5: Solve for x
    x = 7,737,812,497.49/81,165.90
  6. Step 6: Final answer
    x = 95,333.29

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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.