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Finding the Fourth Proportional to 542.58, 813.98 and 172.42

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Solution

The fourth proportional to 542.58, 813.98 and 172.42 is: 258.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    542.58 : 813.98 = 172.42 : x
  2. Step 2: Convert to fraction form
    542.58/813.98 = 172.42/x
  3. Step 3: Cross multiply
    542.58x = 813.98 × 172.42
  4. Step 4: Simplify right side
    542.58x = 140,346.43
  5. Step 5: Solve for x
    x = 140,346.43/542.58
  6. Step 6: Final answer
    x = 258.66

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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.