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Finding the Fourth Proportional to 10,661.52, 15,990.12 and 2,868.51

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Solution

The fourth proportional to 10,661.52, 15,990.12 and 2,868.51 is: 4,302.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,661.52 : 15,990.12 = 2,868.51 : x
  2. Step 2: Convert to fraction form
    10,661.52/15,990.12 = 2,868.51/x
  3. Step 3: Cross multiply
    10,661.52x = 15,990.12 × 2,868.51
  4. Step 4: Simplify right side
    10,661.52x = 45,867,819.12
  5. Step 5: Solve for x
    x = 45,867,819.12/10,661.52
  6. Step 6: Final answer
    x = 4,302.18

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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.