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Finding the Fourth Proportional to 266.81, 400.26 and 84.15

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Solution

The fourth proportional to 266.81, 400.26 and 84.15 is: 126.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    266.81 : 400.26 = 84.15 : x
  2. Step 2: Convert to fraction form
    266.81/400.26 = 84.15/x
  3. Step 3: Cross multiply
    266.81x = 400.26 × 84.15
  4. Step 4: Simplify right side
    266.81x = 33,681.67
  5. Step 5: Solve for x
    x = 33,681.67/266.81
  6. Step 6: Final answer
    x = 126.24

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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.