Home / 128,984.43-178,065.32-100,239.87

Finding the Fourth Proportional to 128,984.43, 178,065.32 and 100,239.87

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Solution

The fourth proportional to 128,984.43, 178,065.32 and 100,239.87 is: 138,382.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,984.43 : 178,065.32 = 100,239.87 : x
  2. Step 2: Convert to fraction form
    128,984.43/178,065.32 = 100,239.87/x
  3. Step 3: Cross multiply
    128,984.43x = 178,065.32 × 100,239.87
  4. Step 4: Simplify right side
    128,984.43x = 17,849,244,027.11
  5. Step 5: Solve for x
    x = 17,849,244,027.11/128,984.43
  6. Step 6: Final answer
    x = 138,382.94

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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.