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Finding the Fourth Proportional to 85,912.14, 128,918.43 and 35,988

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Solution

The fourth proportional to 85,912.14, 128,918.43 and 35,988 is: 54,003.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,912.14 : 128,918.43 = 35,988 : x
  2. Step 2: Convert to fraction form
    85,912.14/128,918.43 = 35,988/x
  3. Step 3: Cross multiply
    85,912.14x = 128,918.43 × 35,988
  4. Step 4: Simplify right side
    85,912.14x = 4,639,516,458.84
  5. Step 5: Solve for x
    x = 4,639,516,458.84/85,912.14
  6. Step 6: Final answer
    x = 54,003.04

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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.