Home / 78,453.12-108,161.28-64,974.72

Finding the Fourth Proportional to 78,453.12, 108,161.28 and 64,974.72

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Solution

The fourth proportional to 78,453.12, 108,161.28 and 64,974.72 is: 89,578.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,453.12 : 108,161.28 = 64,974.72 : x
  2. Step 2: Convert to fraction form
    78,453.12/108,161.28 = 64,974.72/x
  3. Step 3: Cross multiply
    78,453.12x = 108,161.28 × 64,974.72
  4. Step 4: Simplify right side
    78,453.12x = 7,027,748,882.84
  5. Step 5: Solve for x
    x = 7,027,748,882.84/78,453.12
  6. Step 6: Final answer
    x = 89,578.96

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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.