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Finding the Fourth Proportional to 138,603.35, 191,272.56 and 78,173.87

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Solution

The fourth proportional to 138,603.35, 191,272.56 and 78,173.87 is: 107,879.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,603.35 : 191,272.56 = 78,173.87 : x
  2. Step 2: Convert to fraction form
    138,603.35/191,272.56 = 78,173.87/x
  3. Step 3: Cross multiply
    138,603.35x = 191,272.56 × 78,173.87
  4. Step 4: Simplify right side
    138,603.35x = 14,952,515,283.64
  5. Step 5: Solve for x
    x = 14,952,515,283.64/138,603.35
  6. Step 6: Final answer
    x = 107,879.90

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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.