Home / 139,135.12-191,992.08-78,712.36

Finding the Fourth Proportional to 139,135.12, 191,992.08 and 78,712.36

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Solution

The fourth proportional to 139,135.12, 191,992.08 and 78,712.36 is: 108,614.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,135.12 : 191,992.08 = 78,712.36 : x
  2. Step 2: Convert to fraction form
    139,135.12/191,992.08 = 78,712.36/x
  3. Step 3: Cross multiply
    139,135.12x = 191,992.08 × 78,712.36
  4. Step 4: Simplify right side
    139,135.12x = 15,112,149,718.11
  5. Step 5: Solve for x
    x = 15,112,149,718.11/139,135.12
  6. Step 6: Final answer
    x = 108,614.92

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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.