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Finding the Fourth Proportional to 71.91, 99.43 and 68.63

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Solution

The fourth proportional to 71.91, 99.43 and 68.63 is: 94.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.91 : 99.43 = 68.63 : x
  2. Step 2: Convert to fraction form
    71.91/99.43 = 68.63/x
  3. Step 3: Cross multiply
    71.91x = 99.43 × 68.63
  4. Step 4: Simplify right side
    71.91x = 6,823.21
  5. Step 5: Solve for x
    x = 6,823.21/71.91
  6. Step 6: Final answer
    x = 94.89

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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.