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Finding the Fourth Proportional to 209.54, 313.99 and 87.86

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Solution

The fourth proportional to 209.54, 313.99 and 87.86 is: 131.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.54 : 313.99 = 87.86 : x
  2. Step 2: Convert to fraction form
    209.54/313.99 = 87.86/x
  3. Step 3: Cross multiply
    209.54x = 313.99 × 87.86
  4. Step 4: Simplify right side
    209.54x = 27,587.16
  5. Step 5: Solve for x
    x = 27,587.16/209.54
  6. Step 6: Final answer
    x = 131.66

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