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Finding the Fourth Proportional to 542.85, 813.90 and 299.31

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Solution

The fourth proportional to 542.85, 813.90 and 299.31 is: 448.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    542.85 : 813.90 = 299.31 : x
  2. Step 2: Convert to fraction form
    542.85/813.90 = 299.31/x
  3. Step 3: Cross multiply
    542.85x = 813.90 × 299.31
  4. Step 4: Simplify right side
    542.85x = 243,608.41
  5. Step 5: Solve for x
    x = 243,608.41/542.85
  6. Step 6: Final answer
    x = 448.76

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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.