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Finding the Fourth Proportional to 2,712.13, 4,068.26 and 980.75

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Solution

The fourth proportional to 2,712.13, 4,068.26 and 980.75 is: 1,471.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,712.13 : 4,068.26 = 980.75 : x
  2. Step 2: Convert to fraction form
    2,712.13/4,068.26 = 980.75/x
  3. Step 3: Cross multiply
    2,712.13x = 4,068.26 × 980.75
  4. Step 4: Simplify right side
    2,712.13x = 3,989,946.00
  5. Step 5: Solve for x
    x = 3,989,946.00/2,712.13
  6. Step 6: Final answer
    x = 1,471.15

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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.