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Finding the Fourth Proportional to 266.75, 399.28 and 143.18

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Solution

The fourth proportional to 266.75, 399.28 and 143.18 is: 214.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    266.75 : 399.28 = 143.18 : x
  2. Step 2: Convert to fraction form
    266.75/399.28 = 143.18/x
  3. Step 3: Cross multiply
    266.75x = 399.28 × 143.18
  4. Step 4: Simplify right side
    266.75x = 57,169.55
  5. Step 5: Solve for x
    x = 57,169.55/266.75
  6. Step 6: Final answer
    x = 214.32

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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.