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Finding the Fourth Proportional to 66.94, 99.91 and 57.79

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Solution

The fourth proportional to 66.94, 99.91 and 57.79 is: 86.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.94 : 99.91 = 57.79 : x
  2. Step 2: Convert to fraction form
    66.94/99.91 = 57.79/x
  3. Step 3: Cross multiply
    66.94x = 99.91 × 57.79
  4. Step 4: Simplify right side
    66.94x = 5,773.80
  5. Step 5: Solve for x
    x = 5,773.80/66.94
  6. Step 6: Final answer
    x = 86.25

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.