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Finding the Fourth Proportional to 209.47, 314.21 and 93.89

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Solution

The fourth proportional to 209.47, 314.21 and 93.89 is: 140.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.47 : 314.21 = 93.89 : x
  2. Step 2: Convert to fraction form
    209.47/314.21 = 93.89/x
  3. Step 3: Cross multiply
    209.47x = 314.21 × 93.89
  4. Step 4: Simplify right side
    209.47x = 29,499.14
  5. Step 5: Solve for x
    x = 29,499.14/209.47
  6. Step 6: Final answer
    x = 140.83

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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.