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Finding the Fourth Proportional to 209.90, 314.16 and 194.96

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Solution

The fourth proportional to 209.90, 314.16 and 194.96 is: 291.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.90 : 314.16 = 194.96 : x
  2. Step 2: Convert to fraction form
    209.90/314.16 = 194.96/x
  3. Step 3: Cross multiply
    209.90x = 314.16 × 194.96
  4. Step 4: Simplify right side
    209.90x = 61,248.63
  5. Step 5: Solve for x
    x = 61,248.63/209.90
  6. Step 6: Final answer
    x = 291.80

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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.