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Finding the Fourth Proportional to 97,200.80, 145,455.60 and 67,479.20

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Solution

The fourth proportional to 97,200.80, 145,455.60 and 67,479.20 is: 100,978.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    97,200.80 : 145,455.60 = 67,479.20 : x
  2. Step 2: Convert to fraction form
    97,200.80/145,455.60 = 67,479.20/x
  3. Step 3: Cross multiply
    97,200.80x = 145,455.60 × 67,479.20
  4. Step 4: Simplify right side
    97,200.80x = 9,815,227,523.52
  5. Step 5: Solve for x
    x = 9,815,227,523.52/97,200.80
  6. Step 6: Final answer
    x = 100,978.88

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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.