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Finding the Fourth Proportional to 1,122.85, 1,684.29 and 392.43

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Solution

The fourth proportional to 1,122.85, 1,684.29 and 392.43 is: 588.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,122.85 : 1,684.29 = 392.43 : x
  2. Step 2: Convert to fraction form
    1,122.85/1,684.29 = 392.43/x
  3. Step 3: Cross multiply
    1,122.85x = 1,684.29 × 392.43
  4. Step 4: Simplify right side
    1,122.85x = 660,965.92
  5. Step 5: Solve for x
    x = 660,965.92/1,122.85
  6. Step 6: Final answer
    x = 588.65

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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.