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Finding the Fourth Proportional to 1,269.29, 1,901.85 and 781.31

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Solution

The fourth proportional to 1,269.29, 1,901.85 and 781.31 is: 1,170.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,269.29 : 1,901.85 = 781.31 : x
  2. Step 2: Convert to fraction form
    1,269.29/1,901.85 = 781.31/x
  3. Step 3: Cross multiply
    1,269.29x = 1,901.85 × 781.31
  4. Step 4: Simplify right side
    1,269.29x = 1,485,934.42
  5. Step 5: Solve for x
    x = 1,485,934.42/1,269.29
  6. Step 6: Final answer
    x = 1,170.68

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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.