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Finding the Fourth Proportional to 73,115.20, 109,672.80 and 55,619.20

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Solution

The fourth proportional to 73,115.20, 109,672.80 and 55,619.20 is: 83,428.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    73,115.20 : 109,672.80 = 55,619.20 : x
  2. Step 2: Convert to fraction form
    73,115.20/109,672.80 = 55,619.20/x
  3. Step 3: Cross multiply
    73,115.20x = 109,672.80 × 55,619.20
  4. Step 4: Simplify right side
    73,115.20x = 6,099,913,397.76
  5. Step 5: Solve for x
    x = 6,099,913,397.76/73,115.20
  6. Step 6: Final answer
    x = 83,428.80

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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.