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Finding the Fourth Proportional to 209.48, 313.97 and 87.71

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Solution

The fourth proportional to 209.48, 313.97 and 87.71 is: 131.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.48 : 313.97 = 87.71 : x
  2. Step 2: Convert to fraction form
    209.48/313.97 = 87.71/x
  3. Step 3: Cross multiply
    209.48x = 313.97 × 87.71
  4. Step 4: Simplify right side
    209.48x = 27,536.30
  5. Step 5: Solve for x
    x = 27,536.30/209.48
  6. Step 6: Final answer
    x = 131.45

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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.