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Finding the Fourth Proportional to 15,165.54, 20,904.21 and 10,119.78

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Solution

The fourth proportional to 15,165.54, 20,904.21 and 10,119.78 is: 13,949.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,165.54 : 20,904.21 = 10,119.78 : x
  2. Step 2: Convert to fraction form
    15,165.54/20,904.21 = 10,119.78/x
  3. Step 3: Cross multiply
    15,165.54x = 20,904.21 × 10,119.78
  4. Step 4: Simplify right side
    15,165.54x = 211,546,006.27
  5. Step 5: Solve for x
    x = 211,546,006.27/15,165.54
  6. Step 6: Final answer
    x = 13,949.12

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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.