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Finding the Fourth Proportional to 542.30, 813.40 and 439.08

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Solution

The fourth proportional to 542.30, 813.40 and 439.08 is: 658.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    542.30 : 813.40 = 439.08 : x
  2. Step 2: Convert to fraction form
    542.30/813.40 = 439.08/x
  3. Step 3: Cross multiply
    542.30x = 813.40 × 439.08
  4. Step 4: Simplify right side
    542.30x = 357,147.67
  5. Step 5: Solve for x
    x = 357,147.67/542.30
  6. Step 6: Final answer
    x = 658.58

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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.