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Finding the Fourth Proportional to 39,887.70, 55,042.56 and 21,981.71

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Solution

The fourth proportional to 39,887.70, 55,042.56 and 21,981.71 is: 30,333.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,887.70 : 55,042.56 = 21,981.71 : x
  2. Step 2: Convert to fraction form
    39,887.70/55,042.56 = 21,981.71/x
  3. Step 3: Cross multiply
    39,887.70x = 55,042.56 × 21,981.71
  4. Step 4: Simplify right side
    39,887.70x = 1,209,929,371.54
  5. Step 5: Solve for x
    x = 1,209,929,371.54/39,887.70
  6. Step 6: Final answer
    x = 30,333.39

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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.