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Finding the Fourth Proportional to 616.78, 851.24 and 354.79

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Solution

The fourth proportional to 616.78, 851.24 and 354.79 is: 489.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    616.78 : 851.24 = 354.79 : x
  2. Step 2: Convert to fraction form
    616.78/851.24 = 354.79/x
  3. Step 3: Cross multiply
    616.78x = 851.24 × 354.79
  4. Step 4: Simplify right side
    616.78x = 302,005.41
  5. Step 5: Solve for x
    x = 302,005.41/616.78
  6. Step 6: Final answer
    x = 489.65

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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.