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Finding the Fourth Proportional to 209.80, 313.01 and 189.28

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Solution

The fourth proportional to 209.80, 313.01 and 189.28 is: 282.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.80 : 313.01 = 189.28 : x
  2. Step 2: Convert to fraction form
    209.80/313.01 = 189.28/x
  3. Step 3: Cross multiply
    209.80x = 313.01 × 189.28
  4. Step 4: Simplify right side
    209.80x = 59,246.53
  5. Step 5: Solve for x
    x = 59,246.53/209.80
  6. Step 6: Final answer
    x = 282.40

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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.