Home / 138,634.20-191,314.80-78,204.60

Finding the Fourth Proportional to 138,634.20, 191,314.80 and 78,204.60

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Solution

The fourth proportional to 138,634.20, 191,314.80 and 78,204.60 is: 107,922.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,634.20 : 191,314.80 = 78,204.60 : x
  2. Step 2: Convert to fraction form
    138,634.20/191,314.80 = 78,204.60/x
  3. Step 3: Cross multiply
    138,634.20x = 191,314.80 × 78,204.60
  4. Step 4: Simplify right side
    138,634.20x = 14,961,697,408.08
  5. Step 5: Solve for x
    x = 14,961,697,408.08/138,634.20
  6. Step 6: Final answer
    x = 107,922.12

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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.