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Finding the Fourth Proportional to 411.08, 615.27 and 257.15

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Solution

The fourth proportional to 411.08, 615.27 and 257.15 is: 384.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.08 : 615.27 = 257.15 : x
  2. Step 2: Convert to fraction form
    411.08/615.27 = 257.15/x
  3. Step 3: Cross multiply
    411.08x = 615.27 × 257.15
  4. Step 4: Simplify right side
    411.08x = 158,213.60
  5. Step 5: Solve for x
    x = 158,213.60/411.08
  6. Step 6: Final answer
    x = 384.88

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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.