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Finding the Fourth Proportional to 1,979.76, 2,731.74 and 1,271.76

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Solution

The fourth proportional to 1,979.76, 2,731.74 and 1,271.76 is: 1,754.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,979.76 : 2,731.74 = 1,271.76 : x
  2. Step 2: Convert to fraction form
    1,979.76/2,731.74 = 1,271.76/x
  3. Step 3: Cross multiply
    1,979.76x = 2,731.74 × 1,271.76
  4. Step 4: Simplify right side
    1,979.76x = 3,474,117.66
  5. Step 5: Solve for x
    x = 3,474,117.66/1,979.76
  6. Step 6: Final answer
    x = 1,754.82

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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.