Home / 138,880.26-191,651.13-78,456.42

Finding the Fourth Proportional to 138,880.26, 191,651.13 and 78,456.42

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Solution

The fourth proportional to 138,880.26, 191,651.13 and 78,456.42 is: 108,267.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,880.26 : 191,651.13 = 78,456.42 : x
  2. Step 2: Convert to fraction form
    138,880.26/191,651.13 = 78,456.42/x
  3. Step 3: Cross multiply
    138,880.26x = 191,651.13 × 78,456.42
  4. Step 4: Simplify right side
    138,880.26x = 15,036,261,548.75
  5. Step 5: Solve for x
    x = 15,036,261,548.75/138,880.26
  6. Step 6: Final answer
    x = 108,267.81

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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.