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Finding the Fourth Proportional to 18,390.34, 25,380.54 and 10,839.11

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Solution

The fourth proportional to 18,390.34, 25,380.54 and 10,839.11 is: 14,959.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,390.34 : 25,380.54 = 10,839.11 : x
  2. Step 2: Convert to fraction form
    18,390.34/25,380.54 = 10,839.11/x
  3. Step 3: Cross multiply
    18,390.34x = 25,380.54 × 10,839.11
  4. Step 4: Simplify right side
    18,390.34x = 275,102,464.92
  5. Step 5: Solve for x
    x = 275,102,464.92/18,390.34
  6. Step 6: Final answer
    x = 14,959.07

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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.