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Finding the Fourth Proportional to 81,281.68, 121,937.68 and 36,911.52

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Solution

The fourth proportional to 81,281.68, 121,937.68 and 36,911.52 is: 55,374.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,281.68 : 121,937.68 = 36,911.52 : x
  2. Step 2: Convert to fraction form
    81,281.68/121,937.68 = 36,911.52/x
  3. Step 3: Cross multiply
    81,281.68x = 121,937.68 × 36,911.52
  4. Step 4: Simplify right side
    81,281.68x = 4,500,905,114.07
  5. Step 5: Solve for x
    x = 4,500,905,114.07/81,281.68
  6. Step 6: Final answer
    x = 55,374.16

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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.