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Finding the Fourth Proportional to 81,140.20, 121,621.20 and 28,522.60

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Solution

The fourth proportional to 81,140.20, 121,621.20 and 28,522.60 is: 42,752.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,140.20 : 121,621.20 = 28,522.60 : x
  2. Step 2: Convert to fraction form
    81,140.20/121,621.20 = 28,522.60/x
  3. Step 3: Cross multiply
    81,140.20x = 121,621.20 × 28,522.60
  4. Step 4: Simplify right side
    81,140.20x = 3,468,952,839.12
  5. Step 5: Solve for x
    x = 3,468,952,839.12/81,140.20
  6. Step 6: Final answer
    x = 42,752.58

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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.