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Finding the Fourth Proportional to 209.67, 312.95 and 185.64

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Solution

The fourth proportional to 209.67, 312.95 and 185.64 is: 277.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.67 : 312.95 = 185.64 : x
  2. Step 2: Convert to fraction form
    209.67/312.95 = 185.64/x
  3. Step 3: Cross multiply
    209.67x = 312.95 × 185.64
  4. Step 4: Simplify right side
    209.67x = 58,095.11
  5. Step 5: Solve for x
    x = 58,095.11/209.67
  6. Step 6: Final answer
    x = 277.08

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.