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Finding the Fourth Proportional to 143.55, 215.00 and 71.25

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Solution

The fourth proportional to 143.55, 215.00 and 71.25 is: 106.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.55 : 215.00 = 71.25 : x
  2. Step 2: Convert to fraction form
    143.55/215.00 = 71.25/x
  3. Step 3: Cross multiply
    143.55x = 215.00 × 71.25
  4. Step 4: Simplify right side
    143.55x = 15,318.39
  5. Step 5: Solve for x
    x = 15,318.39/143.55
  6. Step 6: Final answer
    x = 106.71

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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.