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Finding the Fourth Proportional to 1,811.90, 2,717.96 and 887.90

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Solution

The fourth proportional to 1,811.90, 2,717.96 and 887.90 is: 1,331.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,811.90 : 2,717.96 = 887.90 : x
  2. Step 2: Convert to fraction form
    1,811.90/2,717.96 = 887.90/x
  3. Step 3: Cross multiply
    1,811.90x = 2,717.96 × 887.90
  4. Step 4: Simplify right side
    1,811.90x = 2,413,258.65
  5. Step 5: Solve for x
    x = 2,413,258.65/1,811.90
  6. Step 6: Final answer
    x = 1,331.89

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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.