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Finding the Fourth Proportional to 991.04, 1,366.90 and 658.90

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Solution

The fourth proportional to 991.04, 1,366.90 and 658.90 is: 908.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.04 : 1,366.90 = 658.90 : x
  2. Step 2: Convert to fraction form
    991.04/1,366.90 = 658.90/x
  3. Step 3: Cross multiply
    991.04x = 1,366.90 × 658.90
  4. Step 4: Simplify right side
    991.04x = 900,650.41
  5. Step 5: Solve for x
    x = 900,650.41/991.04
  6. Step 6: Final answer
    x = 908.79

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.