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Finding the Fourth Proportional to 1,121.43, 1,683.97 and 691.32

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Solution

The fourth proportional to 1,121.43, 1,683.97 and 691.32 is: 1,038.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.43 : 1,683.97 = 691.32 : x
  2. Step 2: Convert to fraction form
    1,121.43/1,683.97 = 691.32/x
  3. Step 3: Cross multiply
    1,121.43x = 1,683.97 × 691.32
  4. Step 4: Simplify right side
    1,121.43x = 1,164,162.14
  5. Step 5: Solve for x
    x = 1,164,162.14/1,121.43
  6. Step 6: Final answer
    x = 1,038.11

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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.