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Finding the Fourth Proportional to 78,151.56, 117,243.54 and 31,408.08

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Solution

The fourth proportional to 78,151.56, 117,243.54 and 31,408.08 is: 47,118.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,151.56 : 117,243.54 = 31,408.08 : x
  2. Step 2: Convert to fraction form
    78,151.56/117,243.54 = 31,408.08/x
  3. Step 3: Cross multiply
    78,151.56x = 117,243.54 × 31,408.08
  4. Step 4: Simplify right side
    78,151.56x = 3,682,394,483.80
  5. Step 5: Solve for x
    x = 3,682,394,483.80/78,151.56
  6. Step 6: Final answer
    x = 47,118.63

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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.