Home / 20,695.70-31,020.47-8,212.39

Finding the Fourth Proportional to 20,695.70, 31,020.47 and 8,212.39

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Solution

The fourth proportional to 20,695.70, 31,020.47 and 8,212.39 is: 12,309.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,695.70 : 31,020.47 = 8,212.39 : x
  2. Step 2: Convert to fraction form
    20,695.70/31,020.47 = 8,212.39/x
  3. Step 3: Cross multiply
    20,695.70x = 31,020.47 × 8,212.39
  4. Step 4: Simplify right side
    20,695.70x = 254,752,109.81
  5. Step 5: Solve for x
    x = 254,752,109.81/20,695.70
  6. Step 6: Final answer
    x = 12,309.42

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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.