Home / 20,979.63-31,469.45-7,128.63

Finding the Fourth Proportional to 20,979.63, 31,469.45 and 7,128.63

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Solution

The fourth proportional to 20,979.63, 31,469.45 and 7,128.63 is: 10,692.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,979.63 : 31,469.45 = 7,128.63 : x
  2. Step 2: Convert to fraction form
    20,979.63/31,469.45 = 7,128.63/x
  3. Step 3: Cross multiply
    20,979.63x = 31,469.45 × 7,128.63
  4. Step 4: Simplify right side
    20,979.63x = 224,334,148.29
  5. Step 5: Solve for x
    x = 224,334,148.29/20,979.63
  6. Step 6: Final answer
    x = 10,692.95

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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.