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Finding the Fourth Proportional to 1,122.57, 1,683.33 and 392.05

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Solution

The fourth proportional to 1,122.57, 1,683.33 and 392.05 is: 587.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,122.57 : 1,683.33 = 392.05 : x
  2. Step 2: Convert to fraction form
    1,122.57/1,683.33 = 392.05/x
  3. Step 3: Cross multiply
    1,122.57x = 1,683.33 × 392.05
  4. Step 4: Simplify right side
    1,122.57x = 659,949.53
  5. Step 5: Solve for x
    x = 659,949.53/1,122.57
  6. Step 6: Final answer
    x = 587.89

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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.