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Finding the Fourth Proportional to 28,221.73, 38,947.74 and 15,646.48

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Solution

The fourth proportional to 28,221.73, 38,947.74 and 15,646.48 is: 21,593.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,221.73 : 38,947.74 = 15,646.48 : x
  2. Step 2: Convert to fraction form
    28,221.73/38,947.74 = 15,646.48/x
  3. Step 3: Cross multiply
    28,221.73x = 38,947.74 × 15,646.48
  4. Step 4: Simplify right side
    28,221.73x = 609,394,937.59
  5. Step 5: Solve for x
    x = 609,394,937.59/28,221.73
  6. Step 6: Final answer
    x = 21,593.11

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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.