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Finding the Fourth Proportional to 1,928.66, 2,891.13 and 1,188.71

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Solution

The fourth proportional to 1,928.66, 2,891.13 and 1,188.71 is: 1,781.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,928.66 : 2,891.13 = 1,188.71 : x
  2. Step 2: Convert to fraction form
    1,928.66/2,891.13 = 1,188.71/x
  3. Step 3: Cross multiply
    1,928.66x = 2,891.13 × 1,188.71
  4. Step 4: Simplify right side
    1,928.66x = 3,436,715.14
  5. Step 5: Solve for x
    x = 3,436,715.14/1,928.66
  6. Step 6: Final answer
    x = 1,781.92

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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.