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Finding the Fourth Proportional to 70,527, 105,794.82 and 21,279

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Solution

The fourth proportional to 70,527, 105,794.82 and 21,279 is: 31,919.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,527 : 105,794.82 = 21,279 : x
  2. Step 2: Convert to fraction form
    70,527/105,794.82 = 21,279/x
  3. Step 3: Cross multiply
    70,527x = 105,794.82 × 21,279
  4. Step 4: Simplify right side
    70,527x = 2,251,207,974.78
  5. Step 5: Solve for x
    x = 2,251,207,974.78/70,527
  6. Step 6: Final answer
    x = 31,919.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.