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Finding the Fourth Proportional to 616.89, 851.19 and 380.65

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Solution

The fourth proportional to 616.89, 851.19 and 380.65 is: 525.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    616.89 : 851.19 = 380.65 : x
  2. Step 2: Convert to fraction form
    616.89/851.19 = 380.65/x
  3. Step 3: Cross multiply
    616.89x = 851.19 × 380.65
  4. Step 4: Simplify right side
    616.89x = 324,001.22
  5. Step 5: Solve for x
    x = 324,001.22/616.89
  6. Step 6: Final answer
    x = 525.22

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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.