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Finding the Fourth Proportional to 989.53, 1,481.19 and 659.82

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Solution

The fourth proportional to 989.53, 1,481.19 and 659.82 is: 987.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.53 : 1,481.19 = 659.82 : x
  2. Step 2: Convert to fraction form
    989.53/1,481.19 = 659.82/x
  3. Step 3: Cross multiply
    989.53x = 1,481.19 × 659.82
  4. Step 4: Simplify right side
    989.53x = 977,318.79
  5. Step 5: Solve for x
    x = 977,318.79/989.53
  6. Step 6: Final answer
    x = 987.66

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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.