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Finding the Fourth Proportional to 989.48, 1,481.10 and 679.52

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Solution

The fourth proportional to 989.48, 1,481.10 and 679.52 is: 1,017.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.48 : 1,481.10 = 679.52 : x
  2. Step 2: Convert to fraction form
    989.48/1,481.10 = 679.52/x
  3. Step 3: Cross multiply
    989.48x = 1,481.10 × 679.52
  4. Step 4: Simplify right side
    989.48x = 1,006,429.67
  5. Step 5: Solve for x
    x = 1,006,429.67/989.48
  6. Step 6: Final answer
    x = 1,017.14

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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.