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Finding the Fourth Proportional to 20,910.12, 31,365.18 and 7,059.12

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Solution

The fourth proportional to 20,910.12, 31,365.18 and 7,059.12 is: 10,588.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,910.12 : 31,365.18 = 7,059.12 : x
  2. Step 2: Convert to fraction form
    20,910.12/31,365.18 = 7,059.12/x
  3. Step 3: Cross multiply
    20,910.12x = 31,365.18 × 7,059.12
  4. Step 4: Simplify right side
    20,910.12x = 221,410,569.44
  5. Step 5: Solve for x
    x = 221,410,569.44/20,910.12
  6. Step 6: Final answer
    x = 10,588.68

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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.