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Finding the Fourth Proportional to 411.16, 615.88 and 257.16

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Solution

The fourth proportional to 411.16, 615.88 and 257.16 is: 385.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.16 : 615.88 = 257.16 : x
  2. Step 2: Convert to fraction form
    411.16/615.88 = 257.16/x
  3. Step 3: Cross multiply
    411.16x = 615.88 × 257.16
  4. Step 4: Simplify right side
    411.16x = 158,379.70
  5. Step 5: Solve for x
    x = 158,379.70/411.16
  6. Step 6: Final answer
    x = 385.20

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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.