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Finding the Fourth Proportional to 621.86, 932.78 and 256.64

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Solution

The fourth proportional to 621.86, 932.78 and 256.64 is: 384.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.86 : 932.78 = 256.64 : x
  2. Step 2: Convert to fraction form
    621.86/932.78 = 256.64/x
  3. Step 3: Cross multiply
    621.86x = 932.78 × 256.64
  4. Step 4: Simplify right side
    621.86x = 239,382.71
  5. Step 5: Solve for x
    x = 239,382.71/621.86
  6. Step 6: Final answer
    x = 384.95

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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.