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Finding the Fourth Proportional to 406.92, 560.88 and 391.80

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Solution

The fourth proportional to 406.92, 560.88 and 391.80 is: 540.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    406.92 : 560.88 = 391.80 : x
  2. Step 2: Convert to fraction form
    406.92/560.88 = 391.80/x
  3. Step 3: Cross multiply
    406.92x = 560.88 × 391.80
  4. Step 4: Simplify right side
    406.92x = 219,752.78
  5. Step 5: Solve for x
    x = 219,752.78/406.92
  6. Step 6: Final answer
    x = 540.04

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.