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Finding the Fourth Proportional to 121,281.20, 181,921.80 and 42,387.20

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Solution

The fourth proportional to 121,281.20, 181,921.80 and 42,387.20 is: 63,580.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,281.20 : 181,921.80 = 42,387.20 : x
  2. Step 2: Convert to fraction form
    121,281.20/181,921.80 = 42,387.20/x
  3. Step 3: Cross multiply
    121,281.20x = 181,921.80 × 42,387.20
  4. Step 4: Simplify right side
    121,281.20x = 7,711,155,720.96
  5. Step 5: Solve for x
    x = 7,711,155,720.96/121,281.20
  6. Step 6: Final answer
    x = 63,580.80

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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.