Home / 1,127.20-1,691.36-761.18

Finding the Fourth Proportional to 1,127.20, 1,691.36 and 761.18

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Solution

The fourth proportional to 1,127.20, 1,691.36 and 761.18 is: 1,142.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,127.20 : 1,691.36 = 761.18 : x
  2. Step 2: Convert to fraction form
    1,127.20/1,691.36 = 761.18/x
  3. Step 3: Cross multiply
    1,127.20x = 1,691.36 × 761.18
  4. Step 4: Simplify right side
    1,127.20x = 1,287,429.83
  5. Step 5: Solve for x
    x = 1,287,429.83/1,127.20
  6. Step 6: Final answer
    x = 1,142.15

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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.