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Finding the Fourth Proportional to 891.10, 1,228.26 and 681.04

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Solution

The fourth proportional to 891.10, 1,228.26 and 681.04 is: 938.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.10 : 1,228.26 = 681.04 : x
  2. Step 2: Convert to fraction form
    891.10/1,228.26 = 681.04/x
  3. Step 3: Cross multiply
    891.10x = 1,228.26 × 681.04
  4. Step 4: Simplify right side
    891.10x = 836,494.19
  5. Step 5: Solve for x
    x = 836,494.19/891.10
  6. Step 6: Final answer
    x = 938.72

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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.