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Finding the Fourth Proportional to 18,215, 25,127.82 and 11,129.08

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Solution

The fourth proportional to 18,215, 25,127.82 and 11,129.08 is: 15,352.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,215 : 25,127.82 = 11,129.08 : x
  2. Step 2: Convert to fraction form
    18,215/25,127.82 = 11,129.08/x
  3. Step 3: Cross multiply
    18,215x = 25,127.82 × 11,129.08
  4. Step 4: Simplify right side
    18,215x = 279,649,519.01
  5. Step 5: Solve for x
    x = 279,649,519.01/18,215
  6. Step 6: Final answer
    x = 15,352.70

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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.