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Finding the Fourth Proportional to 819.89, 1,230.18 and 491.46

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Solution

The fourth proportional to 819.89, 1,230.18 and 491.46 is: 737.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.89 : 1,230.18 = 491.46 : x
  2. Step 2: Convert to fraction form
    819.89/1,230.18 = 491.46/x
  3. Step 3: Cross multiply
    819.89x = 1,230.18 × 491.46
  4. Step 4: Simplify right side
    819.89x = 604,586.11
  5. Step 5: Solve for x
    x = 604,586.11/819.89
  6. Step 6: Final answer
    x = 737.40

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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.