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Finding the Fourth Proportional to 1,489.65, 2,234.19 and 515.55

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Solution

The fourth proportional to 1,489.65, 2,234.19 and 515.55 is: 773.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,489.65 : 2,234.19 = 515.55 : x
  2. Step 2: Convert to fraction form
    1,489.65/2,234.19 = 515.55/x
  3. Step 3: Cross multiply
    1,489.65x = 2,234.19 × 515.55
  4. Step 4: Simplify right side
    1,489.65x = 1,151,836.65
  5. Step 5: Solve for x
    x = 1,151,836.65/1,489.65
  6. Step 6: Final answer
    x = 773.23

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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.