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Finding the Fourth Proportional to 616.78, 851.10 and 354.74

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Solution

The fourth proportional to 616.78, 851.10 and 354.74 is: 489.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    616.78 : 851.10 = 354.74 : x
  2. Step 2: Convert to fraction form
    616.78/851.10 = 354.74/x
  3. Step 3: Cross multiply
    616.78x = 851.10 × 354.74
  4. Step 4: Simplify right side
    616.78x = 301,919.21
  5. Step 5: Solve for x
    x = 301,919.21/616.78
  6. Step 6: Final answer
    x = 489.51

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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.