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Finding the Fourth Proportional to 72,512.76, 108,770.40 and 19,921.92

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Solution

The fourth proportional to 72,512.76, 108,770.40 and 19,921.92 is: 29,883.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,512.76 : 108,770.40 = 19,921.92 : x
  2. Step 2: Convert to fraction form
    72,512.76/108,770.40 = 19,921.92/x
  3. Step 3: Cross multiply
    72,512.76x = 108,770.40 × 19,921.92
  4. Step 4: Simplify right side
    72,512.76x = 2,166,915,207.17
  5. Step 5: Solve for x
    x = 2,166,915,207.17/72,512.76
  6. Step 6: Final answer
    x = 29,883.23

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.