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Finding the Fourth Proportional to 616.80, 851.08 and 395.64

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Solution

The fourth proportional to 616.80, 851.08 and 395.64 is: 545.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    616.80 : 851.08 = 395.64 : x
  2. Step 2: Convert to fraction form
    616.80/851.08 = 395.64/x
  3. Step 3: Cross multiply
    616.80x = 851.08 × 395.64
  4. Step 4: Simplify right side
    616.80x = 336,721.29
  5. Step 5: Solve for x
    x = 336,721.29/616.80
  6. Step 6: Final answer
    x = 545.92

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.