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Finding the Fourth Proportional to 125,391.89, 173,040.83 and 71,678.09

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Solution

The fourth proportional to 125,391.89, 173,040.83 and 71,678.09 is: 98,915.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,391.89 : 173,040.83 = 71,678.09 : x
  2. Step 2: Convert to fraction form
    125,391.89/173,040.83 = 71,678.09/x
  3. Step 3: Cross multiply
    125,391.89x = 173,040.83 × 71,678.09
  4. Step 4: Simplify right side
    125,391.89x = 12,403,234,962.82
  5. Step 5: Solve for x
    x = 12,403,234,962.82/125,391.89
  6. Step 6: Final answer
    x = 98,915.77

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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.