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Finding the Fourth Proportional to 819.99, 1,230.26 and 542.50

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Solution

The fourth proportional to 819.99, 1,230.26 and 542.50 is: 813.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.99 : 1,230.26 = 542.50 : x
  2. Step 2: Convert to fraction form
    819.99/1,230.26 = 542.50/x
  3. Step 3: Cross multiply
    819.99x = 1,230.26 × 542.50
  4. Step 4: Simplify right side
    819.99x = 667,410.26
  5. Step 5: Solve for x
    x = 667,410.26/819.99
  6. Step 6: Final answer
    x = 813.92

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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.