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Finding the Fourth Proportional to 1,121.37, 1,683.89 and 691.26

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Solution

The fourth proportional to 1,121.37, 1,683.89 and 691.26 is: 1,038.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.37 : 1,683.89 = 691.26 : x
  2. Step 2: Convert to fraction form
    1,121.37/1,683.89 = 691.26/x
  3. Step 3: Cross multiply
    1,121.37x = 1,683.89 × 691.26
  4. Step 4: Simplify right side
    1,121.37x = 1,164,002.35
  5. Step 5: Solve for x
    x = 1,164,002.35/1,121.37
  6. Step 6: Final answer
    x = 1,038.02

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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.