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Finding the Fourth Proportional to 39,886.41, 55,043.25 and 21,981.41

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Solution

The fourth proportional to 39,886.41, 55,043.25 and 21,981.41 is: 30,334.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,886.41 : 55,043.25 = 21,981.41 : x
  2. Step 2: Convert to fraction form
    39,886.41/55,043.25 = 21,981.41/x
  3. Step 3: Cross multiply
    39,886.41x = 55,043.25 × 21,981.41
  4. Step 4: Simplify right side
    39,886.41x = 1,209,928,383.60
  5. Step 5: Solve for x
    x = 1,209,928,383.60/39,886.41
  6. Step 6: Final answer
    x = 30,334.35

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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.