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Finding the Fourth Proportional to 18,659.11, 25,744.47 and 12,987.49

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Solution

The fourth proportional to 18,659.11, 25,744.47 and 12,987.49 is: 17,919.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,659.11 : 25,744.47 = 12,987.49 : x
  2. Step 2: Convert to fraction form
    18,659.11/25,744.47 = 12,987.49/x
  3. Step 3: Cross multiply
    18,659.11x = 25,744.47 × 12,987.49
  4. Step 4: Simplify right side
    18,659.11x = 334,356,046.68
  5. Step 5: Solve for x
    x = 334,356,046.68/18,659.11
  6. Step 6: Final answer
    x = 17,919.19

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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.