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Finding the Fourth Proportional to 557.60, 769.12 and 391.52

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Solution

The fourth proportional to 557.60, 769.12 and 391.52 is: 540.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    557.60 : 769.12 = 391.52 : x
  2. Step 2: Convert to fraction form
    557.60/769.12 = 391.52/x
  3. Step 3: Cross multiply
    557.60x = 769.12 × 391.52
  4. Step 4: Simplify right side
    557.60x = 301,125.86
  5. Step 5: Solve for x
    x = 301,125.86/557.60
  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.