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Finding the Fourth Proportional to 1,531.71, 2,113.73 and 868.57

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Solution

The fourth proportional to 1,531.71, 2,113.73 and 868.57 is: 1,198.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,531.71 : 2,113.73 = 868.57 : x
  2. Step 2: Convert to fraction form
    1,531.71/2,113.73 = 868.57/x
  3. Step 3: Cross multiply
    1,531.71x = 2,113.73 × 868.57
  4. Step 4: Simplify right side
    1,531.71x = 1,835,916.10
  5. Step 5: Solve for x
    x = 1,835,916.10/1,531.71
  6. Step 6: Final answer
    x = 1,198.61

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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.