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Finding the Fourth Proportional to 143.26, 214.87 and 66.21

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Solution

The fourth proportional to 143.26, 214.87 and 66.21 is: 99.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.26 : 214.87 = 66.21 : x
  2. Step 2: Convert to fraction form
    143.26/214.87 = 66.21/x
  3. Step 3: Cross multiply
    143.26x = 214.87 × 66.21
  4. Step 4: Simplify right side
    143.26x = 14,226.54
  5. Step 5: Solve for x
    x = 14,226.54/143.26
  6. Step 6: Final answer
    x = 99.31

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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.