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Finding the Fourth Proportional to 846, 1,167.96 and 638.64

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Solution

The fourth proportional to 846, 1,167.96 and 638.64 is: 881.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    846 : 1,167.96 = 638.64 : x
  2. Step 2: Convert to fraction form
    846/1,167.96 = 638.64/x
  3. Step 3: Cross multiply
    846x = 1,167.96 × 638.64
  4. Step 4: Simplify right side
    846x = 745,905.97
  5. Step 5: Solve for x
    x = 745,905.97/846
  6. Step 6: Final answer
    x = 881.69

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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.