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Finding the Fourth Proportional to 1,954.61, 2,932.74 and 721.71

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Solution

The fourth proportional to 1,954.61, 2,932.74 and 721.71 is: 1,082.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,954.61 : 2,932.74 = 721.71 : x
  2. Step 2: Convert to fraction form
    1,954.61/2,932.74 = 721.71/x
  3. Step 3: Cross multiply
    1,954.61x = 2,932.74 × 721.71
  4. Step 4: Simplify right side
    1,954.61x = 2,116,587.79
  5. Step 5: Solve for x
    x = 2,116,587.79/1,954.61
  6. Step 6: Final answer
    x = 1,082.87

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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.