Home / 172,138.78-258,307.94-72,290.35

Finding the Fourth Proportional to 172,138.78, 258,307.94 and 72,290.35

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Solution

The fourth proportional to 172,138.78, 258,307.94 and 72,290.35 is: 108,477.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,138.78 : 258,307.94 = 72,290.35 : x
  2. Step 2: Convert to fraction form
    172,138.78/258,307.94 = 72,290.35/x
  3. Step 3: Cross multiply
    172,138.78x = 258,307.94 × 72,290.35
  4. Step 4: Simplify right side
    172,138.78x = 18,673,171,390.38
  5. Step 5: Solve for x
    x = 18,673,171,390.38/172,138.78
  6. Step 6: Final answer
    x = 108,477.42

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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.