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Finding the Fourth Proportional to 18,643.70, 25,718.61 and 11,557.82

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Solution

The fourth proportional to 18,643.70, 25,718.61 and 11,557.82 is: 15,943.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,643.70 : 25,718.61 = 11,557.82 : x
  2. Step 2: Convert to fraction form
    18,643.70/25,718.61 = 11,557.82/x
  3. Step 3: Cross multiply
    18,643.70x = 25,718.61 × 11,557.82
  4. Step 4: Simplify right side
    18,643.70x = 297,250,936.44
  5. Step 5: Solve for x
    x = 297,250,936.44/18,643.70
  6. Step 6: Final answer
    x = 15,943.78

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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.