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Finding the Fourth Proportional to 543.89, 815.31 and 178.47

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Solution

The fourth proportional to 543.89, 815.31 and 178.47 is: 267.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    543.89 : 815.31 = 178.47 : x
  2. Step 2: Convert to fraction form
    543.89/815.31 = 178.47/x
  3. Step 3: Cross multiply
    543.89x = 815.31 × 178.47
  4. Step 4: Simplify right side
    543.89x = 145,510.86
  5. Step 5: Solve for x
    x = 145,510.86/543.89
  6. Step 6: Final answer
    x = 267.54

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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.