Home / 20,678.70-28,536.24-11,247.21

Finding the Fourth Proportional to 20,678.70, 28,536.24 and 11,247.21

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Solution

The fourth proportional to 20,678.70, 28,536.24 and 11,247.21 is: 15,520.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,678.70 : 28,536.24 = 11,247.21 : x
  2. Step 2: Convert to fraction form
    20,678.70/28,536.24 = 11,247.21/x
  3. Step 3: Cross multiply
    20,678.70x = 28,536.24 × 11,247.21
  4. Step 4: Simplify right side
    20,678.70x = 320,953,083.89
  5. Step 5: Solve for x
    x = 320,953,083.89/20,678.70
  6. Step 6: Final answer
    x = 15,520.95

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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.