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Finding the Fourth Proportional to 959.85, 1,321.92 and 889.38

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Solution

The fourth proportional to 959.85, 1,321.92 and 889.38 is: 1,224.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.85 : 1,321.92 = 889.38 : x
  2. Step 2: Convert to fraction form
    959.85/1,321.92 = 889.38/x
  3. Step 3: Cross multiply
    959.85x = 1,321.92 × 889.38
  4. Step 4: Simplify right side
    959.85x = 1,175,689.21
  5. Step 5: Solve for x
    x = 1,175,689.21/959.85
  6. Step 6: Final answer
    x = 1,224.87

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1.5x scale

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.