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Finding the Fourth Proportional to 549.07, 823.57 and 138.21

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Solution

The fourth proportional to 549.07, 823.57 and 138.21 is: 207.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    549.07 : 823.57 = 138.21 : x
  2. Step 2: Convert to fraction form
    549.07/823.57 = 138.21/x
  3. Step 3: Cross multiply
    549.07x = 823.57 × 138.21
  4. Step 4: Simplify right side
    549.07x = 113,825.61
  5. Step 5: Solve for x
    x = 113,825.61/549.07
  6. Step 6: Final answer
    x = 207.31

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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.