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Finding the Fourth Proportional to 991.97, 1,489.78 and 626.86

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Solution

The fourth proportional to 991.97, 1,489.78 and 626.86 is: 941.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.97 : 1,489.78 = 626.86 : x
  2. Step 2: Convert to fraction form
    991.97/1,489.78 = 626.86/x
  3. Step 3: Cross multiply
    991.97x = 1,489.78 × 626.86
  4. Step 4: Simplify right side
    991.97x = 933,883.49
  5. Step 5: Solve for x
    x = 933,883.49/991.97
  6. Step 6: Final answer
    x = 941.44

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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.