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Finding the Fourth Proportional to 143.07, 214.39 and 61.87

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Solution

The fourth proportional to 143.07, 214.39 and 61.87 is: 92.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.07 : 214.39 = 61.87 : x
  2. Step 2: Convert to fraction form
    143.07/214.39 = 61.87/x
  3. Step 3: Cross multiply
    143.07x = 214.39 × 61.87
  4. Step 4: Simplify right side
    143.07x = 13,264.31
  5. Step 5: Solve for x
    x = 13,264.31/143.07
  6. Step 6: Final answer
    x = 92.71

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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.