Home / 20,865.21-28,778.28-14,491.81

Finding the Fourth Proportional to 20,865.21, 28,778.28 and 14,491.81

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Solution

The fourth proportional to 20,865.21, 28,778.28 and 14,491.81 is: 19,987.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,865.21 : 28,778.28 = 14,491.81 : x
  2. Step 2: Convert to fraction form
    20,865.21/28,778.28 = 14,491.81/x
  3. Step 3: Cross multiply
    20,865.21x = 28,778.28 × 14,491.81
  4. Step 4: Simplify right side
    20,865.21x = 417,049,222.00
  5. Step 5: Solve for x
    x = 417,049,222.00/20,865.21
  6. Step 6: Final answer
    x = 19,987.78

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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.