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Finding the Fourth Proportional to 209.44, 314.04 and 87.57

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Solution

The fourth proportional to 209.44, 314.04 and 87.57 is: 131.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.44 : 314.04 = 87.57 : x
  2. Step 2: Convert to fraction form
    209.44/314.04 = 87.57/x
  3. Step 3: Cross multiply
    209.44x = 314.04 × 87.57
  4. Step 4: Simplify right side
    209.44x = 27,500.81
  5. Step 5: Solve for x
    x = 27,500.81/209.44
  6. Step 6: Final answer
    x = 131.31

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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.