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Finding the Fourth Proportional to 1,489.34, 2,234.54 and 905.53

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Solution

The fourth proportional to 1,489.34, 2,234.54 and 905.53 is: 1,358.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,489.34 : 2,234.54 = 905.53 : x
  2. Step 2: Convert to fraction form
    1,489.34/2,234.54 = 905.53/x
  3. Step 3: Cross multiply
    1,489.34x = 2,234.54 × 905.53
  4. Step 4: Simplify right side
    1,489.34x = 2,023,443.01
  5. Step 5: Solve for x
    x = 2,023,443.01/1,489.34
  6. Step 6: Final answer
    x = 1,358.62

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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.