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Finding the Fourth Proportional to 39,778.70, 54,895.70 and 21,630.71

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Solution

The fourth proportional to 39,778.70, 54,895.70 and 21,630.71 is: 29,850.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,778.70 : 54,895.70 = 21,630.71 : x
  2. Step 2: Convert to fraction form
    39,778.70/54,895.70 = 21,630.71/x
  3. Step 3: Cross multiply
    39,778.70x = 54,895.70 × 21,630.71
  4. Step 4: Simplify right side
    39,778.70x = 1,187,432,584.31
  5. Step 5: Solve for x
    x = 1,187,432,584.31/39,778.70
  6. Step 6: Final answer
    x = 29,850.97

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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.