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Finding the Fourth Proportional to 18,931.44, 26,101.12 and 15,515.88

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Solution

The fourth proportional to 18,931.44, 26,101.12 and 15,515.88 is: 21,392.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,931.44 : 26,101.12 = 15,515.88 : x
  2. Step 2: Convert to fraction form
    18,931.44/26,101.12 = 15,515.88/x
  3. Step 3: Cross multiply
    18,931.44x = 26,101.12 × 15,515.88
  4. Step 4: Simplify right side
    18,931.44x = 404,981,845.79
  5. Step 5: Solve for x
    x = 404,981,845.79/18,931.44
  6. Step 6: Final answer
    x = 21,392.03

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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.