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Finding the Fourth Proportional to 1,375.72, 1,900.14 and 878.20

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Solution

The fourth proportional to 1,375.72, 1,900.14 and 878.20 is: 1,212.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,375.72 : 1,900.14 = 878.20 : x
  2. Step 2: Convert to fraction form
    1,375.72/1,900.14 = 878.20/x
  3. Step 3: Cross multiply
    1,375.72x = 1,900.14 × 878.20
  4. Step 4: Simplify right side
    1,375.72x = 1,668,702.95
  5. Step 5: Solve for x
    x = 1,668,702.95/1,375.72
  6. Step 6: Final answer
    x = 1,212.97

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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.