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Finding the Fourth Proportional to 20,628.27, 30,921.75 and 7,477.11

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Solution

The fourth proportional to 20,628.27, 30,921.75 and 7,477.11 is: 11,208.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,628.27 : 30,921.75 = 7,477.11 : x
  2. Step 2: Convert to fraction form
    20,628.27/30,921.75 = 7,477.11/x
  3. Step 3: Cross multiply
    20,628.27x = 30,921.75 × 7,477.11
  4. Step 4: Simplify right side
    20,628.27x = 231,205,326.14
  5. Step 5: Solve for x
    x = 231,205,326.14/20,628.27
  6. Step 6: Final answer
    x = 11,208.18

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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.