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Finding the Fourth Proportional to 143.36, 214.85 and 66.31

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Solution

The fourth proportional to 143.36, 214.85 and 66.31 is: 99.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.36 : 214.85 = 66.31 : x
  2. Step 2: Convert to fraction form
    143.36/214.85 = 66.31/x
  3. Step 3: Cross multiply
    143.36x = 214.85 × 66.31
  4. Step 4: Simplify right side
    143.36x = 14,245.30
  5. Step 5: Solve for x
    x = 14,245.30/143.36
  6. Step 6: Final answer
    x = 99.37

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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.