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Finding the Fourth Proportional to 65,754.96, 90,745.20 and 38,912.88

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Solution

The fourth proportional to 65,754.96, 90,745.20 and 38,912.88 is: 53,701.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,754.96 : 90,745.20 = 38,912.88 : x
  2. Step 2: Convert to fraction form
    65,754.96/90,745.20 = 38,912.88/x
  3. Step 3: Cross multiply
    65,754.96x = 90,745.20 × 38,912.88
  4. Step 4: Simplify right side
    65,754.96x = 3,531,157,078.18
  5. Step 5: Solve for x
    x = 3,531,157,078.18/65,754.96
  6. Step 6: Final answer
    x = 53,701.76

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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.