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Finding the Fourth Proportional to 68.91, 95.18 and 57.89

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Solution

The fourth proportional to 68.91, 95.18 and 57.89 is: 79.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.91 : 95.18 = 57.89 : x
  2. Step 2: Convert to fraction form
    68.91/95.18 = 57.89/x
  3. Step 3: Cross multiply
    68.91x = 95.18 × 57.89
  4. Step 4: Simplify right side
    68.91x = 5,509.20
  5. Step 5: Solve for x
    x = 5,509.20/68.91
  6. Step 6: Final answer
    x = 79.95

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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.