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Finding the Fourth Proportional to 266.49, 399.91 and 84.01

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Solution

The fourth proportional to 266.49, 399.91 and 84.01 is: 126.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    266.49 : 399.91 = 84.01 : x
  2. Step 2: Convert to fraction form
    266.49/399.91 = 84.01/x
  3. Step 3: Cross multiply
    266.49x = 399.91 × 84.01
  4. Step 4: Simplify right side
    266.49x = 33,596.97
  5. Step 5: Solve for x
    x = 33,596.97/266.49
  6. Step 6: Final answer
    x = 126.07

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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.