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Finding the Fourth Proportional to 143.20, 214.87 and 66.25

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Solution

The fourth proportional to 143.20, 214.87 and 66.25 is: 99.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.20 : 214.87 = 66.25 : x
  2. Step 2: Convert to fraction form
    143.20/214.87 = 66.25/x
  3. Step 3: Cross multiply
    143.20x = 214.87 × 66.25
  4. Step 4: Simplify right side
    143.20x = 14,235.14
  5. Step 5: Solve for x
    x = 14,235.14/143.20
  6. Step 6: Final answer
    x = 99.41

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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.