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Finding the Fourth Proportional to 18,761.63, 25,891.85 and 10,378.13

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Solution

The fourth proportional to 18,761.63, 25,891.85 and 10,378.13 is: 14,322.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,761.63 : 25,891.85 = 10,378.13 : x
  2. Step 2: Convert to fraction form
    18,761.63/25,891.85 = 10,378.13/x
  3. Step 3: Cross multiply
    18,761.63x = 25,891.85 × 10,378.13
  4. Step 4: Simplify right side
    18,761.63x = 268,708,881.73
  5. Step 5: Solve for x
    x = 268,708,881.73/18,761.63
  6. Step 6: Final answer
    x = 14,322.26

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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.