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Finding the Fourth Proportional to 989.87, 1,484.84 and 759.18

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Solution

The fourth proportional to 989.87, 1,484.84 and 759.18 is: 1,138.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.87 : 1,484.84 = 759.18 : x
  2. Step 2: Convert to fraction form
    989.87/1,484.84 = 759.18/x
  3. Step 3: Cross multiply
    989.87x = 1,484.84 × 759.18
  4. Step 4: Simplify right side
    989.87x = 1,127,257.04
  5. Step 5: Solve for x
    x = 1,127,257.04/989.87
  6. Step 6: Final answer
    x = 1,138.79

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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.