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Finding the Fourth Proportional to 209.67, 314.58 and 140.54

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Solution

The fourth proportional to 209.67, 314.58 and 140.54 is: 210.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.67 : 314.58 = 140.54 : x
  2. Step 2: Convert to fraction form
    209.67/314.58 = 140.54/x
  3. Step 3: Cross multiply
    209.67x = 314.58 × 140.54
  4. Step 4: Simplify right side
    209.67x = 44,209.50
  5. Step 5: Solve for x
    x = 44,209.50/209.67
  6. Step 6: Final answer
    x = 210.85

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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.