Home / 138,890.15-191,683.96-78,464.68

Finding the Fourth Proportional to 138,890.15, 191,683.96 and 78,464.68

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Solution

The fourth proportional to 138,890.15, 191,683.96 and 78,464.68 is: 108,290.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,890.15 : 191,683.96 = 78,464.68 : x
  2. Step 2: Convert to fraction form
    138,890.15/191,683.96 = 78,464.68/x
  3. Step 3: Cross multiply
    138,890.15x = 191,683.96 × 78,464.68
  4. Step 4: Simplify right side
    138,890.15x = 15,040,419,907.16
  5. Step 5: Solve for x
    x = 15,040,419,907.16/138,890.15
  6. Step 6: Final answer
    x = 108,290.04

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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.