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Finding the Fourth Proportional to 209.66, 314.55 and 87.98

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Solution

The fourth proportional to 209.66, 314.55 and 87.98 is: 131.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.66 : 314.55 = 87.98 : x
  2. Step 2: Convert to fraction form
    209.66/314.55 = 87.98/x
  3. Step 3: Cross multiply
    209.66x = 314.55 × 87.98
  4. Step 4: Simplify right side
    209.66x = 27,672.54
  5. Step 5: Solve for x
    x = 27,672.54/209.66
  6. Step 6: Final answer
    x = 131.99

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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.