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Finding the Fourth Proportional to 39,888.70, 55,043.94 and 21,982.71

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Solution

The fourth proportional to 39,888.70, 55,043.94 and 21,982.71 is: 30,334.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,888.70 : 55,043.94 = 21,982.71 : x
  2. Step 2: Convert to fraction form
    39,888.70/55,043.94 = 21,982.71/x
  3. Step 3: Cross multiply
    39,888.70x = 55,043.94 × 21,982.71
  4. Step 4: Simplify right side
    39,888.70x = 1,210,014,970.28
  5. Step 5: Solve for x
    x = 1,210,014,970.28/39,888.70
  6. Step 6: Final answer
    x = 30,334.78

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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.