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Finding the Fourth Proportional to 555.11, 764.87 and 397.61

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Solution

The fourth proportional to 555.11, 764.87 and 397.61 is: 547.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    555.11 : 764.87 = 397.61 : x
  2. Step 2: Convert to fraction form
    555.11/764.87 = 397.61/x
  3. Step 3: Cross multiply
    555.11x = 764.87 × 397.61
  4. Step 4: Simplify right side
    555.11x = 304,114.15
  5. Step 5: Solve for x
    x = 304,114.15/555.11
  6. Step 6: Final answer
    x = 547.85

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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.