Home / 138,896.05-191,708.00-78,501.72

Finding the Fourth Proportional to 138,896.05, 191,708.00 and 78,501.72

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Solution

The fourth proportional to 138,896.05, 191,708.00 and 78,501.72 is: 108,350.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,896.05 : 191,708.00 = 78,501.72 : x
  2. Step 2: Convert to fraction form
    138,896.05/191,708.00 = 78,501.72/x
  3. Step 3: Cross multiply
    138,896.05x = 191,708.00 × 78,501.72
  4. Step 4: Simplify right side
    138,896.05x = 15,049,408,480.33
  5. Step 5: Solve for x
    x = 15,049,408,480.33/138,896.05
  6. Step 6: Final answer
    x = 108,350.15

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1.5x scale

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.