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Finding the Fourth Proportional to 20,960.70, 31,440.15 and 7,109.70

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Solution

The fourth proportional to 20,960.70, 31,440.15 and 7,109.70 is: 10,664.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,960.70 : 31,440.15 = 7,109.70 : x
  2. Step 2: Convert to fraction form
    20,960.70/31,440.15 = 7,109.70/x
  3. Step 3: Cross multiply
    20,960.70x = 31,440.15 × 7,109.70
  4. Step 4: Simplify right side
    20,960.70x = 223,530,034.46
  5. Step 5: Solve for x
    x = 223,530,034.46/20,960.70
  6. Step 6: Final answer
    x = 10,664.24

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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.