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Finding the Fourth Proportional to 1,272.85, 1,909.91 and 542.97

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Solution

The fourth proportional to 1,272.85, 1,909.91 and 542.97 is: 814.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.85 : 1,909.91 = 542.97 : x
  2. Step 2: Convert to fraction form
    1,272.85/1,909.91 = 542.97/x
  3. Step 3: Cross multiply
    1,272.85x = 1,909.91 × 542.97
  4. Step 4: Simplify right side
    1,272.85x = 1,037,025.19
  5. Step 5: Solve for x
    x = 1,037,025.19/1,272.85
  6. Step 6: Final answer
    x = 814.73

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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.