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Finding the Fourth Proportional to 616.64, 850.89 and 380.55

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Solution

The fourth proportional to 616.64, 850.89 and 380.55 is: 525.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    616.64 : 850.89 = 380.55 : x
  2. Step 2: Convert to fraction form
    616.64/850.89 = 380.55/x
  3. Step 3: Cross multiply
    616.64x = 850.89 × 380.55
  4. Step 4: Simplify right side
    616.64x = 323,806.19
  5. Step 5: Solve for x
    x = 323,806.19/616.64
  6. Step 6: Final answer
    x = 525.11

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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.