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Finding the Fourth Proportional to 139,058.07, 191,898.97 and 78,640.57

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Solution

The fourth proportional to 139,058.07, 191,898.97 and 78,640.57 is: 108,523.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,058.07 : 191,898.97 = 78,640.57 : x
  2. Step 2: Convert to fraction form
    139,058.07/191,898.97 = 78,640.57/x
  3. Step 3: Cross multiply
    139,058.07x = 191,898.97 × 78,640.57
  4. Step 4: Simplify right side
    139,058.07x = 15,091,044,868.84
  5. Step 5: Solve for x
    x = 15,091,044,868.84/139,058.07
  6. Step 6: Final answer
    x = 108,523.33

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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.