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Finding the Fourth Proportional to 67,147.20, 100,720.80 and 40,420.80

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Solution

The fourth proportional to 67,147.20, 100,720.80 and 40,420.80 is: 60,631.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,147.20 : 100,720.80 = 40,420.80 : x
  2. Step 2: Convert to fraction form
    67,147.20/100,720.80 = 40,420.80/x
  3. Step 3: Cross multiply
    67,147.20x = 100,720.80 × 40,420.80
  4. Step 4: Simplify right side
    67,147.20x = 4,071,215,312.64
  5. Step 5: Solve for x
    x = 4,071,215,312.64/67,147.20
  6. Step 6: Final answer
    x = 60,631.20

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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.