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Finding the Fourth Proportional to 542.74, 813.39 and 447.70

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Solution

The fourth proportional to 542.74, 813.39 and 447.70 is: 670.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    542.74 : 813.39 = 447.70 : x
  2. Step 2: Convert to fraction form
    542.74/813.39 = 447.70/x
  3. Step 3: Cross multiply
    542.74x = 813.39 × 447.70
  4. Step 4: Simplify right side
    542.74x = 364,154.70
  5. Step 5: Solve for x
    x = 364,154.70/542.74
  6. Step 6: Final answer
    x = 670.96

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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.