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Finding the Fourth Proportional to 18,645.66, 25,731.66 and 10,689.38

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Solution

The fourth proportional to 18,645.66, 25,731.66 and 10,689.38 is: 14,751.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,645.66 : 25,731.66 = 10,689.38 : x
  2. Step 2: Convert to fraction form
    18,645.66/25,731.66 = 10,689.38/x
  3. Step 3: Cross multiply
    18,645.66x = 25,731.66 × 10,689.38
  4. Step 4: Simplify right side
    18,645.66x = 275,055,491.77
  5. Step 5: Solve for x
    x = 275,055,491.77/18,645.66
  6. Step 6: Final answer
    x = 14,751.72

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1.5x scale

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.