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Finding the Fourth Proportional to 1,979.74, 2,731.74 and 1,129

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Solution

The fourth proportional to 1,979.74, 2,731.74 and 1,129 is: 1,557.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,979.74 : 2,731.74 = 1,129 : x
  2. Step 2: Convert to fraction form
    1,979.74/2,731.74 = 1,129/x
  3. Step 3: Cross multiply
    1,979.74x = 2,731.74 × 1,129
  4. Step 4: Simplify right side
    1,979.74x = 3,084,134.46
  5. Step 5: Solve for x
    x = 3,084,134.46/1,979.74
  6. Step 6: Final answer
    x = 1,557.85

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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.