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Finding the Fourth Proportional to 65,680.50, 90,639.09 and 35,872.50

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Solution

The fourth proportional to 65,680.50, 90,639.09 and 35,872.50 is: 49,504.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,680.50 : 90,639.09 = 35,872.50 : x
  2. Step 2: Convert to fraction form
    65,680.50/90,639.09 = 35,872.50/x
  3. Step 3: Cross multiply
    65,680.50x = 90,639.09 × 35,872.50
  4. Step 4: Simplify right side
    65,680.50x = 3,251,450,756.03
  5. Step 5: Solve for x
    x = 3,251,450,756.03/65,680.50
  6. Step 6: Final answer
    x = 49,504.05

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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.