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Finding the Fourth Proportional to 821.14, 1,134.03 and 691.18

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Solution

The fourth proportional to 821.14, 1,134.03 and 691.18 is: 954.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.14 : 1,134.03 = 691.18 : x
  2. Step 2: Convert to fraction form
    821.14/1,134.03 = 691.18/x
  3. Step 3: Cross multiply
    821.14x = 1,134.03 × 691.18
  4. Step 4: Simplify right side
    821.14x = 783,818.86
  5. Step 5: Solve for x
    x = 783,818.86/821.14
  6. Step 6: Final answer
    x = 954.55

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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.