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Finding the Fourth Proportional to 28,179.20, 38,881.60 and 15,601.60

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Solution

The fourth proportional to 28,179.20, 38,881.60 and 15,601.60 is: 21,527.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,179.20 : 38,881.60 = 15,601.60 : x
  2. Step 2: Convert to fraction form
    28,179.20/38,881.60 = 15,601.60/x
  3. Step 3: Cross multiply
    28,179.20x = 38,881.60 × 15,601.60
  4. Step 4: Simplify right side
    28,179.20x = 606,615,170.56
  5. Step 5: Solve for x
    x = 606,615,170.56/28,179.20
  6. Step 6: Final answer
    x = 21,527.05

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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.