Home / 100,028.09-138,088.92-77,315.78

Finding the Fourth Proportional to 100,028.09, 138,088.92 and 77,315.78

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Solution

The fourth proportional to 100,028.09, 138,088.92 and 77,315.78 is: 106,734.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,028.09 : 138,088.92 = 77,315.78 : x
  2. Step 2: Convert to fraction form
    100,028.09/138,088.92 = 77,315.78/x
  3. Step 3: Cross multiply
    100,028.09x = 138,088.92 × 77,315.78
  4. Step 4: Simplify right side
    100,028.09x = 10,676,451,868.71
  5. Step 5: Solve for x
    x = 10,676,451,868.71/100,028.09
  6. Step 6: Final answer
    x = 106,734.54

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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.