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Finding the Fourth Proportional to 911.22, 1,259.16 and 689.80

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Solution

The fourth proportional to 911.22, 1,259.16 and 689.80 is: 953.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.22 : 1,259.16 = 689.80 : x
  2. Step 2: Convert to fraction form
    911.22/1,259.16 = 689.80/x
  3. Step 3: Cross multiply
    911.22x = 1,259.16 × 689.80
  4. Step 4: Simplify right side
    911.22x = 868,568.57
  5. Step 5: Solve for x
    x = 868,568.57/911.22
  6. Step 6: Final answer
    x = 953.19

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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.