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Finding the Fourth Proportional to 18,695.74, 25,786.11 and 13,030.78

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Solution

The fourth proportional to 18,695.74, 25,786.11 and 13,030.78 is: 17,972.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,695.74 : 25,786.11 = 13,030.78 : x
  2. Step 2: Convert to fraction form
    18,695.74/25,786.11 = 13,030.78/x
  3. Step 3: Cross multiply
    18,695.74x = 25,786.11 × 13,030.78
  4. Step 4: Simplify right side
    18,695.74x = 336,013,126.47
  5. Step 5: Solve for x
    x = 336,013,126.47/18,695.74
  6. Step 6: Final answer
    x = 17,972.71

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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.