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Finding the Fourth Proportional to 814.55, 1,219.98 and 489.23

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Solution

The fourth proportional to 814.55, 1,219.98 and 489.23 is: 732.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    814.55 : 1,219.98 = 489.23 : x
  2. Step 2: Convert to fraction form
    814.55/1,219.98 = 489.23/x
  3. Step 3: Cross multiply
    814.55x = 1,219.98 × 489.23
  4. Step 4: Simplify right side
    814.55x = 596,850.82
  5. Step 5: Solve for x
    x = 596,850.82/814.55
  6. Step 6: Final answer
    x = 732.74

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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.