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Finding the Fourth Proportional to 85,912.65, 128,919.18 and 35,988.48

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Solution

The fourth proportional to 85,912.65, 128,919.18 and 35,988.48 is: 54,003.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,912.65 : 128,919.18 = 35,988.48 : x
  2. Step 2: Convert to fraction form
    85,912.65/128,919.18 = 35,988.48/x
  3. Step 3: Cross multiply
    85,912.65x = 128,919.18 × 35,988.48
  4. Step 4: Simplify right side
    85,912.65x = 4,639,605,331.05
  5. Step 5: Solve for x
    x = 4,639,605,331.05/85,912.65
  6. Step 6: Final answer
    x = 54,003.75

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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.