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Finding the Fourth Proportional to 557.35, 767.88 and 391.30

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Solution

The fourth proportional to 557.35, 767.88 and 391.30 is: 539.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    557.35 : 767.88 = 391.30 : x
  2. Step 2: Convert to fraction form
    557.35/767.88 = 391.30/x
  3. Step 3: Cross multiply
    557.35x = 767.88 × 391.30
  4. Step 4: Simplify right side
    557.35x = 300,469.52
  5. Step 5: Solve for x
    x = 300,469.52/557.35
  6. Step 6: Final answer
    x = 539.11

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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.