Home / 137,678.08-189,973.20-81,081.76

Finding the Fourth Proportional to 137,678.08, 189,973.20 and 81,081.76

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Solution

The fourth proportional to 137,678.08, 189,973.20 and 81,081.76 is: 111,879.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,678.08 : 189,973.20 = 81,081.76 : x
  2. Step 2: Convert to fraction form
    137,678.08/189,973.20 = 81,081.76/x
  3. Step 3: Cross multiply
    137,678.08x = 189,973.20 × 81,081.76
  4. Step 4: Simplify right side
    137,678.08x = 15,403,361,408.83
  5. Step 5: Solve for x
    x = 15,403,361,408.83/137,678.08
  6. Step 6: Final answer
    x = 111,879.55

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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.