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Finding the Fourth Proportional to 172,578.24, 258,900 and 67,390.56

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Solution

The fourth proportional to 172,578.24, 258,900 and 67,390.56 is: 101,098.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,578.24 : 258,900 = 67,390.56 : x
  2. Step 2: Convert to fraction form
    172,578.24/258,900 = 67,390.56/x
  3. Step 3: Cross multiply
    172,578.24x = 258,900 × 67,390.56
  4. Step 4: Simplify right side
    172,578.24x = 17,447,415,984
  5. Step 5: Solve for x
    x = 17,447,415,984/172,578.24
  6. Step 6: Final answer
    x = 101,098.59

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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.