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Finding the Fourth Proportional to 209.90, 289.90 and 187.01

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Solution

The fourth proportional to 209.90, 289.90 and 187.01 is: 258.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.90 : 289.90 = 187.01 : x
  2. Step 2: Convert to fraction form
    209.90/289.90 = 187.01/x
  3. Step 3: Cross multiply
    209.90x = 289.90 × 187.01
  4. Step 4: Simplify right side
    209.90x = 54,211.81
  5. Step 5: Solve for x
    x = 54,211.81/209.90
  6. Step 6: Final answer
    x = 258.27

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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.