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Finding the Fourth Proportional to 991.80, 1,486.68 and 667.26

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Solution

The fourth proportional to 991.80, 1,486.68 and 667.26 is: 1,000.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.80 : 1,486.68 = 667.26 : x
  2. Step 2: Convert to fraction form
    991.80/1,486.68 = 667.26/x
  3. Step 3: Cross multiply
    991.80x = 1,486.68 × 667.26
  4. Step 4: Simplify right side
    991.80x = 992,002.10
  5. Step 5: Solve for x
    x = 992,002.10/991.80
  6. Step 6: Final answer
    x = 1,000.20

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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.