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Finding the Fourth Proportional to 172,979.70, 238,713.81 and 100,398.65

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Solution

The fourth proportional to 172,979.70, 238,713.81 and 100,398.65 is: 138,551.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,979.70 : 238,713.81 = 100,398.65 : x
  2. Step 2: Convert to fraction form
    172,979.70/238,713.81 = 100,398.65/x
  3. Step 3: Cross multiply
    172,979.70x = 238,713.81 × 100,398.65
  4. Step 4: Simplify right side
    172,979.70x = 23,966,543,066.79
  5. Step 5: Solve for x
    x = 23,966,543,066.79/172,979.70
  6. Step 6: Final answer
    x = 138,551.19

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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.