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Finding the Fourth Proportional to 103.91, 143.41 and 62.47

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Solution

The fourth proportional to 103.91, 143.41 and 62.47 is: 86.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.91 : 143.41 = 62.47 : x
  2. Step 2: Convert to fraction form
    103.91/143.41 = 62.47/x
  3. Step 3: Cross multiply
    103.91x = 143.41 × 62.47
  4. Step 4: Simplify right side
    103.91x = 8,958.31
  5. Step 5: Solve for x
    x = 8,958.31/103.91
  6. Step 6: Final answer
    x = 86.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.