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Finding the Fourth Proportional to 18,778.92, 25,913.16 and 11,223.76

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Solution

The fourth proportional to 18,778.92, 25,913.16 and 11,223.76 is: 15,487.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,778.92 : 25,913.16 = 11,223.76 : x
  2. Step 2: Convert to fraction form
    18,778.92/25,913.16 = 11,223.76/x
  3. Step 3: Cross multiply
    18,778.92x = 25,913.16 × 11,223.76
  4. Step 4: Simplify right side
    18,778.92x = 290,843,088.68
  5. Step 5: Solve for x
    x = 290,843,088.68/18,778.92
  6. Step 6: Final answer
    x = 15,487.74

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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.