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Finding the Fourth Proportional to 172,291.05, 258,330.74 and 66,987.27

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Solution

The fourth proportional to 172,291.05, 258,330.74 and 66,987.27 is: 100,439.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,291.05 : 258,330.74 = 66,987.27 : x
  2. Step 2: Convert to fraction form
    172,291.05/258,330.74 = 66,987.27/x
  3. Step 3: Cross multiply
    172,291.05x = 258,330.74 × 66,987.27
  4. Step 4: Simplify right side
    172,291.05x = 17,304,870,694.74
  5. Step 5: Solve for x
    x = 17,304,870,694.74/172,291.05
  6. Step 6: Final answer
    x = 100,439.75

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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.