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Finding the Fourth Proportional to 18,645.78, 25,731.78 and 10,689.51

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Solution

The fourth proportional to 18,645.78, 25,731.78 and 10,689.51 is: 14,751.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,645.78 : 25,731.78 = 10,689.51 : x
  2. Step 2: Convert to fraction form
    18,645.78/25,731.78 = 10,689.51/x
  3. Step 3: Cross multiply
    18,645.78x = 25,731.78 × 10,689.51
  4. Step 4: Simplify right side
    18,645.78x = 275,060,119.63
  5. Step 5: Solve for x
    x = 275,060,119.63/18,645.78
  6. Step 6: Final answer
    x = 14,751.87

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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.