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Finding the Fourth Proportional to 1,122.29, 1,683.65 and 391.89

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Solution

The fourth proportional to 1,122.29, 1,683.65 and 391.89 is: 587.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,122.29 : 1,683.65 = 391.89 : x
  2. Step 2: Convert to fraction form
    1,122.29/1,683.65 = 391.89/x
  3. Step 3: Cross multiply
    1,122.29x = 1,683.65 × 391.89
  4. Step 4: Simplify right side
    1,122.29x = 659,805.60
  5. Step 5: Solve for x
    x = 659,805.60/1,122.29
  6. Step 6: Final answer
    x = 587.91

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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.