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Finding the Fourth Proportional to 28,221.79, 38,947.83 and 15,646.54

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Solution

The fourth proportional to 28,221.79, 38,947.83 and 15,646.54 is: 21,593.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,221.79 : 38,947.83 = 15,646.54 : x
  2. Step 2: Convert to fraction form
    28,221.79/38,947.83 = 15,646.54/x
  3. Step 3: Cross multiply
    28,221.79x = 38,947.83 × 15,646.54
  4. Step 4: Simplify right side
    28,221.79x = 609,398,780.01
  5. Step 5: Solve for x
    x = 609,398,780.01/28,221.79
  6. Step 6: Final answer
    x = 21,593.20

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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.