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Finding the Fourth Proportional to 1,489.23, 2,233.44 and 515.21

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Solution

The fourth proportional to 1,489.23, 2,233.44 and 515.21 is: 772.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,489.23 : 2,233.44 = 515.21 : x
  2. Step 2: Convert to fraction form
    1,489.23/2,233.44 = 515.21/x
  3. Step 3: Cross multiply
    1,489.23x = 2,233.44 × 515.21
  4. Step 4: Simplify right side
    1,489.23x = 1,150,679.46
  5. Step 5: Solve for x
    x = 1,150,679.46/1,489.23
  6. Step 6: Final answer
    x = 772.67

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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.