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Finding the Fourth Proportional to 836.11, 1,154.93 and 642.02

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Solution

The fourth proportional to 836.11, 1,154.93 and 642.02 is: 886.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    836.11 : 1,154.93 = 642.02 : x
  2. Step 2: Convert to fraction form
    836.11/1,154.93 = 642.02/x
  3. Step 3: Cross multiply
    836.11x = 1,154.93 × 642.02
  4. Step 4: Simplify right side
    836.11x = 741,488.16
  5. Step 5: Solve for x
    x = 741,488.16/836.11
  6. Step 6: Final answer
    x = 886.83

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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.