Home / 138,921.78-208,287.81-66,836.64

Finding the Fourth Proportional to 138,921.78, 208,287.81 and 66,836.64

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Solution

The fourth proportional to 138,921.78, 208,287.81 and 66,836.64 is: 100,209.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,921.78 : 208,287.81 = 66,836.64 : x
  2. Step 2: Convert to fraction form
    138,921.78/208,287.81 = 66,836.64/x
  3. Step 3: Cross multiply
    138,921.78x = 208,287.81 × 66,836.64
  4. Step 4: Simplify right side
    138,921.78x = 13,921,257,373.36
  5. Step 5: Solve for x
    x = 13,921,257,373.36/138,921.78
  6. Step 6: Final answer
    x = 100,209.32

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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.