Home / 138,819.72-191,559.63-81,453.09

Finding the Fourth Proportional to 138,819.72, 191,559.63 and 81,453.09

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Solution

The fourth proportional to 138,819.72, 191,559.63 and 81,453.09 is: 112,398.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,819.72 : 191,559.63 = 81,453.09 : x
  2. Step 2: Convert to fraction form
    138,819.72/191,559.63 = 81,453.09/x
  3. Step 3: Cross multiply
    138,819.72x = 191,559.63 × 81,453.09
  4. Step 4: Simplify right side
    138,819.72x = 15,603,124,806.55
  5. Step 5: Solve for x
    x = 15,603,124,806.55/138,819.72
  6. Step 6: Final answer
    x = 112,398.47

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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.