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Finding the Fourth Proportional to 18,389.92, 25,380 and 10,838.64

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Solution

The fourth proportional to 18,389.92, 25,380 and 10,838.64 is: 14,958.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,389.92 : 25,380 = 10,838.64 : x
  2. Step 2: Convert to fraction form
    18,389.92/25,380 = 10,838.64/x
  3. Step 3: Cross multiply
    18,389.92x = 25,380 × 10,838.64
  4. Step 4: Simplify right side
    18,389.92x = 275,084,683.20
  5. Step 5: Solve for x
    x = 275,084,683.20/18,389.92
  6. Step 6: Final answer
    x = 14,958.45

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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.