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Finding the Fourth Proportional to 209.06, 288.37 and 155.85

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Solution

The fourth proportional to 209.06, 288.37 and 155.85 is: 214.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.06 : 288.37 = 155.85 : x
  2. Step 2: Convert to fraction form
    209.06/288.37 = 155.85/x
  3. Step 3: Cross multiply
    209.06x = 288.37 × 155.85
  4. Step 4: Simplify right side
    209.06x = 44,941.02
  5. Step 5: Solve for x
    x = 44,941.02/209.06
  6. Step 6: Final answer
    x = 214.97

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.