Home / 138,911.12-191,696.93-78,481.74

Finding the Fourth Proportional to 138,911.12, 191,696.93 and 78,481.74

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Solution

The fourth proportional to 138,911.12, 191,696.93 and 78,481.74 is: 108,304.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,911.12 : 191,696.93 = 78,481.74 : x
  2. Step 2: Convert to fraction form
    138,911.12/191,696.93 = 78,481.74/x
  3. Step 3: Cross multiply
    138,911.12x = 191,696.93 × 78,481.74
  4. Step 4: Simplify right side
    138,911.12x = 15,044,709,294.50
  5. Step 5: Solve for x
    x = 15,044,709,294.50/138,911.12
  6. Step 6: Final answer
    x = 108,304.57

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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.