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Finding the Fourth Proportional to 39,839, 54,981.48 and 21,937.64

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Solution

The fourth proportional to 39,839, 54,981.48 and 21,937.64 is: 30,275.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,839 : 54,981.48 = 21,937.64 : x
  2. Step 2: Convert to fraction form
    39,839/54,981.48 = 21,937.64/x
  3. Step 3: Cross multiply
    39,839x = 54,981.48 × 21,937.64
  4. Step 4: Simplify right side
    39,839x = 1,206,163,914.91
  5. Step 5: Solve for x
    x = 1,206,163,914.91/39,839
  6. Step 6: Final answer
    x = 30,275.96

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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.