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Finding the Fourth Proportional to 621.81, 932.10 and 256.85

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Solution

The fourth proportional to 621.81, 932.10 and 256.85 is: 385.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.81 : 932.10 = 256.85 : x
  2. Step 2: Convert to fraction form
    621.81/932.10 = 256.85/x
  3. Step 3: Cross multiply
    621.81x = 932.10 × 256.85
  4. Step 4: Simplify right side
    621.81x = 239,407.55
  5. Step 5: Solve for x
    x = 239,407.55/621.81
  6. Step 6: Final answer
    x = 385.02

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.