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Finding the Fourth Proportional to 143.44, 214.99 and 66.39

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Solution

The fourth proportional to 143.44, 214.99 and 66.39 is: 99.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.44 : 214.99 = 66.39 : x
  2. Step 2: Convert to fraction form
    143.44/214.99 = 66.39/x
  3. Step 3: Cross multiply
    143.44x = 214.99 × 66.39
  4. Step 4: Simplify right side
    143.44x = 14,273.19
  5. Step 5: Solve for x
    x = 14,273.19/143.44
  6. Step 6: Final answer
    x = 99.51

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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.