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Finding the Fourth Proportional to 1,257.66, 1,881.72 and 1,081.98

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Solution

The fourth proportional to 1,257.66, 1,881.72 and 1,081.98 is: 1,618.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,257.66 : 1,881.72 = 1,081.98 : x
  2. Step 2: Convert to fraction form
    1,257.66/1,881.72 = 1,081.98/x
  3. Step 3: Cross multiply
    1,257.66x = 1,881.72 × 1,081.98
  4. Step 4: Simplify right side
    1,257.66x = 2,035,983.41
  5. Step 5: Solve for x
    x = 2,035,983.41/1,257.66
  6. Step 6: Final answer
    x = 1,618.87

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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.