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Finding the Fourth Proportional to 971.86, 1,338.90 and 676.61

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Solution

The fourth proportional to 971.86, 1,338.90 and 676.61 is: 932.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.86 : 1,338.90 = 676.61 : x
  2. Step 2: Convert to fraction form
    971.86/1,338.90 = 676.61/x
  3. Step 3: Cross multiply
    971.86x = 1,338.90 × 676.61
  4. Step 4: Simplify right side
    971.86x = 905,913.13
  5. Step 5: Solve for x
    x = 905,913.13/971.86
  6. Step 6: Final answer
    x = 932.14

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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.