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Finding the Fourth Proportional to 15,911.21, 21,955.03 and 9,195.54

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Solution

The fourth proportional to 15,911.21, 21,955.03 and 9,195.54 is: 12,688.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,911.21 : 21,955.03 = 9,195.54 : x
  2. Step 2: Convert to fraction form
    15,911.21/21,955.03 = 9,195.54/x
  3. Step 3: Cross multiply
    15,911.21x = 21,955.03 × 9,195.54
  4. Step 4: Simplify right side
    15,911.21x = 201,888,251.25
  5. Step 5: Solve for x
    x = 201,888,251.25/15,911.21
  6. Step 6: Final answer
    x = 12,688.43

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.