Home / 138,913.26-191,698.83-78,486.72

Finding the Fourth Proportional to 138,913.26, 191,698.83 and 78,486.72

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Solution

The fourth proportional to 138,913.26, 191,698.83 and 78,486.72 is: 108,310.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,913.26 : 191,698.83 = 78,486.72 : x
  2. Step 2: Convert to fraction form
    138,913.26/191,698.83 = 78,486.72/x
  3. Step 3: Cross multiply
    138,913.26x = 191,698.83 × 78,486.72
  4. Step 4: Simplify right side
    138,913.26x = 15,045,812,394.54
  5. Step 5: Solve for x
    x = 15,045,812,394.54/138,913.26
  6. Step 6: Final answer
    x = 108,310.84

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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.