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Finding the Fourth Proportional to 112,991.28, 155,928.96 and 65,252.76

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Solution

The fourth proportional to 112,991.28, 155,928.96 and 65,252.76 is: 90,049.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,991.28 : 155,928.96 = 65,252.76 : x
  2. Step 2: Convert to fraction form
    112,991.28/155,928.96 = 65,252.76/x
  3. Step 3: Cross multiply
    112,991.28x = 155,928.96 × 65,252.76
  4. Step 4: Simplify right side
    112,991.28x = 10,174,795,003.93
  5. Step 5: Solve for x
    x = 10,174,795,003.93/112,991.28
  6. Step 6: Final answer
    x = 90,049.38

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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.