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Finding the Fourth Proportional to 266.60, 398.90 and 189.74

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Solution

The fourth proportional to 266.60, 398.90 and 189.74 is: 283.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    266.60 : 398.90 = 189.74 : x
  2. Step 2: Convert to fraction form
    266.60/398.90 = 189.74/x
  3. Step 3: Cross multiply
    266.60x = 398.90 × 189.74
  4. Step 4: Simplify right side
    266.60x = 75,684.34
  5. Step 5: Solve for x
    x = 75,684.34/266.60
  6. Step 6: Final answer
    x = 283.89

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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.