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Finding the Fourth Proportional to 1,127.80, 1,691.26 and 665.68

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Solution

The fourth proportional to 1,127.80, 1,691.26 and 665.68 is: 998.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,127.80 : 1,691.26 = 665.68 : x
  2. Step 2: Convert to fraction form
    1,127.80/1,691.26 = 665.68/x
  3. Step 3: Cross multiply
    1,127.80x = 1,691.26 × 665.68
  4. Step 4: Simplify right side
    1,127.80x = 1,125,837.96
  5. Step 5: Solve for x
    x = 1,125,837.96/1,127.80
  6. Step 6: Final answer
    x = 998.26

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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.