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Finding the Fourth Proportional to 959.46, 1,321.42 and 886.56

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Solution

The fourth proportional to 959.46, 1,321.42 and 886.56 is: 1,221.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.46 : 1,321.42 = 886.56 : x
  2. Step 2: Convert to fraction form
    959.46/1,321.42 = 886.56/x
  3. Step 3: Cross multiply
    959.46x = 1,321.42 × 886.56
  4. Step 4: Simplify right side
    959.46x = 1,171,518.12
  5. Step 5: Solve for x
    x = 1,171,518.12/959.46
  6. Step 6: Final answer
    x = 1,221.02

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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.