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Finding the Fourth Proportional to 3,279.72, 4,919.76 and 971.28

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Solution

The fourth proportional to 3,279.72, 4,919.76 and 971.28 is: 1,456.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,279.72 : 4,919.76 = 971.28 : x
  2. Step 2: Convert to fraction form
    3,279.72/4,919.76 = 971.28/x
  3. Step 3: Cross multiply
    3,279.72x = 4,919.76 × 971.28
  4. Step 4: Simplify right side
    3,279.72x = 4,778,464.49
  5. Step 5: Solve for x
    x = 4,778,464.49/3,279.72
  6. Step 6: Final answer
    x = 1,456.97

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.