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Finding the Fourth Proportional to 1,249.89, 1,871.91 and 988.13

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Solution

The fourth proportional to 1,249.89, 1,871.91 and 988.13 is: 1,479.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,249.89 : 1,871.91 = 988.13 : x
  2. Step 2: Convert to fraction form
    1,249.89/1,871.91 = 988.13/x
  3. Step 3: Cross multiply
    1,249.89x = 1,871.91 × 988.13
  4. Step 4: Simplify right side
    1,249.89x = 1,849,690.43
  5. Step 5: Solve for x
    x = 1,849,690.43/1,249.89
  6. Step 6: Final answer
    x = 1,479.88

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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.