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Finding the Fourth Proportional to 39,886.97, 55,043.96 and 21,981.96

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Solution

The fourth proportional to 39,886.97, 55,043.96 and 21,981.96 is: 30,335.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,886.97 : 55,043.96 = 21,981.96 : x
  2. Step 2: Convert to fraction form
    39,886.97/55,043.96 = 21,981.96/x
  3. Step 3: Cross multiply
    39,886.97x = 55,043.96 × 21,981.96
  4. Step 4: Simplify right side
    39,886.97x = 1,209,974,017.05
  5. Step 5: Solve for x
    x = 1,209,974,017.05/39,886.97
  6. Step 6: Final answer
    x = 30,335.07

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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.