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Finding the Fourth Proportional to 20,187.84, 30,286.80 and 7,040.40

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Solution

The fourth proportional to 20,187.84, 30,286.80 and 7,040.40 is: 10,562.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,187.84 : 30,286.80 = 7,040.40 : x
  2. Step 2: Convert to fraction form
    20,187.84/30,286.80 = 7,040.40/x
  3. Step 3: Cross multiply
    20,187.84x = 30,286.80 × 7,040.40
  4. Step 4: Simplify right side
    20,187.84x = 213,231,186.72
  5. Step 5: Solve for x
    x = 213,231,186.72/20,187.84
  6. Step 6: Final answer
    x = 10,562.36

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.