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Finding the Fourth Proportional to 2,287.80, 3,157.16 and 1,239.86

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Solution

The fourth proportional to 2,287.80, 3,157.16 and 1,239.86 is: 1,711.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,287.80 : 3,157.16 = 1,239.86 : x
  2. Step 2: Convert to fraction form
    2,287.80/3,157.16 = 1,239.86/x
  3. Step 3: Cross multiply
    2,287.80x = 3,157.16 × 1,239.86
  4. Step 4: Simplify right side
    2,287.80x = 3,914,414.41
  5. Step 5: Solve for x
    x = 3,914,414.41/2,287.80
  6. Step 6: Final answer
    x = 1,711.00

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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.