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Finding the Fourth Proportional to 209.22, 313.75 and 87.42

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Solution

The fourth proportional to 209.22, 313.75 and 87.42 is: 131.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.22 : 313.75 = 87.42 : x
  2. Step 2: Convert to fraction form
    209.22/313.75 = 87.42/x
  3. Step 3: Cross multiply
    209.22x = 313.75 × 87.42
  4. Step 4: Simplify right side
    209.22x = 27,428.03
  5. Step 5: Solve for x
    x = 27,428.03/209.22
  6. Step 6: Final answer
    x = 131.10

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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.