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Finding the Fourth Proportional to 1,541.50, 2,127.21 and 878.44

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Solution

The fourth proportional to 1,541.50, 2,127.21 and 878.44 is: 1,212.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,541.50 : 2,127.21 = 878.44 : x
  2. Step 2: Convert to fraction form
    1,541.50/2,127.21 = 878.44/x
  3. Step 3: Cross multiply
    1,541.50x = 2,127.21 × 878.44
  4. Step 4: Simplify right side
    1,541.50x = 1,868,626.35
  5. Step 5: Solve for x
    x = 1,868,626.35/1,541.50
  6. Step 6: Final answer
    x = 1,212.21

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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.