Home / 18,342.87-25,215.69-15,781.21

Finding the Fourth Proportional to 18,342.87, 25,215.69 and 15,781.21

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Solution

The fourth proportional to 18,342.87, 25,215.69 and 15,781.21 is: 21,694.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,342.87 : 25,215.69 = 15,781.21 : x
  2. Step 2: Convert to fraction form
    18,342.87/25,215.69 = 15,781.21/x
  3. Step 3: Cross multiply
    18,342.87x = 25,215.69 × 15,781.21
  4. Step 4: Simplify right side
    18,342.87x = 397,934,095.33
  5. Step 5: Solve for x
    x = 397,934,095.33/18,342.87
  6. Step 6: Final answer
    x = 21,694.22

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.