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Finding the Fourth Proportional to 616.79, 851.17 and 395.87

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Solution

The fourth proportional to 616.79, 851.17 and 395.87 is: 546.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    616.79 : 851.17 = 395.87 : x
  2. Step 2: Convert to fraction form
    616.79/851.17 = 395.87/x
  3. Step 3: Cross multiply
    616.79x = 851.17 × 395.87
  4. Step 4: Simplify right side
    616.79x = 336,952.67
  5. Step 5: Solve for x
    x = 336,952.67/616.79
  6. Step 6: Final answer
    x = 546.30

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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.