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Finding the Fourth Proportional to 266.20, 398.68 and 261.74

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Solution

The fourth proportional to 266.20, 398.68 and 261.74 is: 392.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    266.20 : 398.68 = 261.74 : x
  2. Step 2: Convert to fraction form
    266.20/398.68 = 261.74/x
  3. Step 3: Cross multiply
    266.20x = 398.68 × 261.74
  4. Step 4: Simplify right side
    266.20x = 104,350.50
  5. Step 5: Solve for x
    x = 104,350.50/266.20
  6. Step 6: Final answer
    x = 392.00

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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.