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Finding the Fourth Proportional to 143.89, 215.61 and 89.71

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Solution

The fourth proportional to 143.89, 215.61 and 89.71 is: 134.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.89 : 215.61 = 89.71 : x
  2. Step 2: Convert to fraction form
    143.89/215.61 = 89.71/x
  3. Step 3: Cross multiply
    143.89x = 215.61 × 89.71
  4. Step 4: Simplify right side
    143.89x = 19,342.37
  5. Step 5: Solve for x
    x = 19,342.37/143.89
  6. Step 6: Final answer
    x = 134.42

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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.