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Finding the Fourth Proportional to 616.75, 851.12 and 354.79

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Solution

The fourth proportional to 616.75, 851.12 and 354.79 is: 489.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    616.75 : 851.12 = 354.79 : x
  2. Step 2: Convert to fraction form
    616.75/851.12 = 354.79/x
  3. Step 3: Cross multiply
    616.75x = 851.12 × 354.79
  4. Step 4: Simplify right side
    616.75x = 301,968.86
  5. Step 5: Solve for x
    x = 301,968.86/616.75
  6. Step 6: Final answer
    x = 489.61

Related Problems

Find fourth proportional to 308.38, 425.56 and 177.40
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1.5x scale

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.