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Finding the Fourth Proportional to 991.68, 1,489.34 and 667.28

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Solution

The fourth proportional to 991.68, 1,489.34 and 667.28 is: 1,002.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.68 : 1,489.34 = 667.28 : x
  2. Step 2: Convert to fraction form
    991.68/1,489.34 = 667.28/x
  3. Step 3: Cross multiply
    991.68x = 1,489.34 × 667.28
  4. Step 4: Simplify right side
    991.68x = 993,806.80
  5. Step 5: Solve for x
    x = 993,806.80/991.68
  6. Step 6: Final answer
    x = 1,002.14

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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.