Home / 20,491.05-30,704.67-12,978.76

Finding the Fourth Proportional to 20,491.05, 30,704.67 and 12,978.76

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Solution

The fourth proportional to 20,491.05, 30,704.67 and 12,978.76 is: 19,447.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,491.05 : 30,704.67 = 12,978.76 : x
  2. Step 2: Convert to fraction form
    20,491.05/30,704.67 = 12,978.76/x
  3. Step 3: Cross multiply
    20,491.05x = 30,704.67 × 12,978.76
  4. Step 4: Simplify right side
    20,491.05x = 398,508,437.26
  5. Step 5: Solve for x
    x = 398,508,437.26/20,491.05
  6. Step 6: Final answer
    x = 19,447.93

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1.5x scale

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.