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Finding the Fourth Proportional to 442,909.20, 664,428.60 and 143,338.80

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Solution

The fourth proportional to 442,909.20, 664,428.60 and 143,338.80 is: 215,029.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    442,909.20 : 664,428.60 = 143,338.80 : x
  2. Step 2: Convert to fraction form
    442,909.20/664,428.60 = 143,338.80/x
  3. Step 3: Cross multiply
    442,909.20x = 664,428.60 × 143,338.80
  4. Step 4: Simplify right side
    442,909.20x = 95,238,398,209.68
  5. Step 5: Solve for x
    x = 95,238,398,209.68/442,909.20
  6. Step 6: Final answer
    x = 215,029.17

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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.