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Finding the Fourth Proportional to 143.25, 215.04 and 85.52

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Solution

The fourth proportional to 143.25, 215.04 and 85.52 is: 128.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.25 : 215.04 = 85.52 : x
  2. Step 2: Convert to fraction form
    143.25/215.04 = 85.52/x
  3. Step 3: Cross multiply
    143.25x = 215.04 × 85.52
  4. Step 4: Simplify right side
    143.25x = 18,389.15
  5. Step 5: Solve for x
    x = 18,389.15/143.25
  6. Step 6: Final answer
    x = 128.37

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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.