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Finding the Fourth Proportional to 321.11, 443.12 and 188.40

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Solution

The fourth proportional to 321.11, 443.12 and 188.40 is: 259.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.11 : 443.12 = 188.40 : x
  2. Step 2: Convert to fraction form
    321.11/443.12 = 188.40/x
  3. Step 3: Cross multiply
    321.11x = 443.12 × 188.40
  4. Step 4: Simplify right side
    321.11x = 83,484.28
  5. Step 5: Solve for x
    x = 83,484.28/321.11
  6. Step 6: Final answer
    x = 259.99

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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.