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Finding the Fourth Proportional to 549.75, 825.15 and 257.47

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Solution

The fourth proportional to 549.75, 825.15 and 257.47 is: 386.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    549.75 : 825.15 = 257.47 : x
  2. Step 2: Convert to fraction form
    549.75/825.15 = 257.47/x
  3. Step 3: Cross multiply
    549.75x = 825.15 × 257.47
  4. Step 4: Simplify right side
    549.75x = 212,445.96
  5. Step 5: Solve for x
    x = 212,445.96/549.75
  6. Step 6: Final answer
    x = 386.44

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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.