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Finding the Fourth Proportional to 2,712.43, 4,068.64 and 980.65

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Solution

The fourth proportional to 2,712.43, 4,068.64 and 980.65 is: 1,470.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,712.43 : 4,068.64 = 980.65 : x
  2. Step 2: Convert to fraction form
    2,712.43/4,068.64 = 980.65/x
  3. Step 3: Cross multiply
    2,712.43x = 4,068.64 × 980.65
  4. Step 4: Simplify right side
    2,712.43x = 3,989,891.47
  5. Step 5: Solve for x
    x = 3,989,891.47/2,712.43
  6. Step 6: Final answer
    x = 1,470.97

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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.