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Finding the Fourth Proportional to 988.34, 1,481.29 and 658.99

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Solution

The fourth proportional to 988.34, 1,481.29 and 658.99 is: 987.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.34 : 1,481.29 = 658.99 : x
  2. Step 2: Convert to fraction form
    988.34/1,481.29 = 658.99/x
  3. Step 3: Cross multiply
    988.34x = 1,481.29 × 658.99
  4. Step 4: Simplify right side
    988.34x = 976,149.95
  5. Step 5: Solve for x
    x = 976,149.95/988.34
  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.