Home / 100,028.17-138,089.06-77,315.87

Finding the Fourth Proportional to 100,028.17, 138,089.06 and 77,315.87

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Solution

The fourth proportional to 100,028.17, 138,089.06 and 77,315.87 is: 106,734.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,028.17 : 138,089.06 = 77,315.87 : x
  2. Step 2: Convert to fraction form
    100,028.17/138,089.06 = 77,315.87/x
  3. Step 3: Cross multiply
    100,028.17x = 138,089.06 × 77,315.87
  4. Step 4: Simplify right side
    100,028.17x = 10,676,476,059.96
  5. Step 5: Solve for x
    x = 10,676,476,059.96/100,028.17
  6. Step 6: Final answer
    x = 106,734.69

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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.