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Finding the Fourth Proportional to 67,431.90, 101,135.70 and 42,427.20

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Solution

The fourth proportional to 67,431.90, 101,135.70 and 42,427.20 is: 63,633.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,431.90 : 101,135.70 = 42,427.20 : x
  2. Step 2: Convert to fraction form
    67,431.90/101,135.70 = 42,427.20/x
  3. Step 3: Cross multiply
    67,431.90x = 101,135.70 × 42,427.20
  4. Step 4: Simplify right side
    67,431.90x = 4,290,904,571.04
  5. Step 5: Solve for x
    x = 4,290,904,571.04/67,431.90
  6. Step 6: Final answer
    x = 63,633.16

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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.