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Finding the Fourth Proportional to 410.31, 615.96 and 256.86

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Solution

The fourth proportional to 410.31, 615.96 and 256.86 is: 385.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    410.31 : 615.96 = 256.86 : x
  2. Step 2: Convert to fraction form
    410.31/615.96 = 256.86/x
  3. Step 3: Cross multiply
    410.31x = 615.96 × 256.86
  4. Step 4: Simplify right side
    410.31x = 158,215.49
  5. Step 5: Solve for x
    x = 158,215.49/410.31
  6. Step 6: Final answer
    x = 385.60

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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.