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Finding the Fourth Proportional to 1,122.52, 1,683.10 and 391.64

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Solution

The fourth proportional to 1,122.52, 1,683.10 and 391.64 is: 587.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,122.52 : 1,683.10 = 391.64 : x
  2. Step 2: Convert to fraction form
    1,122.52/1,683.10 = 391.64/x
  3. Step 3: Cross multiply
    1,122.52x = 1,683.10 × 391.64
  4. Step 4: Simplify right side
    1,122.52x = 659,169.28
  5. Step 5: Solve for x
    x = 659,169.28/1,122.52
  6. Step 6: Final answer
    x = 587.22

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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.