Home / 67,428.09-101,139.71-20,679.75

Finding the Fourth Proportional to 67,428.09, 101,139.71 and 20,679.75

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Solution

The fourth proportional to 67,428.09, 101,139.71 and 20,679.75 is: 31,018.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,428.09 : 101,139.71 = 20,679.75 : x
  2. Step 2: Convert to fraction form
    67,428.09/101,139.71 = 20,679.75/x
  3. Step 3: Cross multiply
    67,428.09x = 101,139.71 × 20,679.75
  4. Step 4: Simplify right side
    67,428.09x = 2,091,543,814.47
  5. Step 5: Solve for x
    x = 2,091,543,814.47/67,428.09
  6. Step 6: Final answer
    x = 31,018.88

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.