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Finding the Fourth Proportional to 18,775.92, 25,909 and 11,220.74

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Solution

The fourth proportional to 18,775.92, 25,909 and 11,220.74 is: 15,483.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,775.92 : 25,909 = 11,220.74 : x
  2. Step 2: Convert to fraction form
    18,775.92/25,909 = 11,220.74/x
  3. Step 3: Cross multiply
    18,775.92x = 25,909 × 11,220.74
  4. Step 4: Simplify right side
    18,775.92x = 290,718,152.66
  5. Step 5: Solve for x
    x = 290,718,152.66/18,775.92
  6. Step 6: Final answer
    x = 15,483.56

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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.