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Finding the Fourth Proportional to 836.05, 1,154.85 and 641.96

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Solution

The fourth proportional to 836.05, 1,154.85 and 641.96 is: 886.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    836.05 : 1,154.85 = 641.96 : x
  2. Step 2: Convert to fraction form
    836.05/1,154.85 = 641.96/x
  3. Step 3: Cross multiply
    836.05x = 1,154.85 × 641.96
  4. Step 4: Simplify right side
    836.05x = 741,367.51
  5. Step 5: Solve for x
    x = 741,367.51/836.05
  6. Step 6: Final answer
    x = 886.75

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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.