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Finding the Fourth Proportional to 542.45, 813.81 and 177.21

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Solution

The fourth proportional to 542.45, 813.81 and 177.21 is: 265.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    542.45 : 813.81 = 177.21 : x
  2. Step 2: Convert to fraction form
    542.45/813.81 = 177.21/x
  3. Step 3: Cross multiply
    542.45x = 813.81 × 177.21
  4. Step 4: Simplify right side
    542.45x = 144,215.27
  5. Step 5: Solve for x
    x = 144,215.27/542.45
  6. Step 6: Final answer
    x = 265.86

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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.