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Finding the Fourth Proportional to 542.15, 813.21 and 171.94

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Solution

The fourth proportional to 542.15, 813.21 and 171.94 is: 257.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    542.15 : 813.21 = 171.94 : x
  2. Step 2: Convert to fraction form
    542.15/813.21 = 171.94/x
  3. Step 3: Cross multiply
    542.15x = 813.21 × 171.94
  4. Step 4: Simplify right side
    542.15x = 139,823.63
  5. Step 5: Solve for x
    x = 139,823.63/542.15
  6. Step 6: Final answer
    x = 257.91

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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.