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Finding the Fourth Proportional to 85.35, 117.68 and 55.79

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Solution

The fourth proportional to 85.35, 117.68 and 55.79 is: 76.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.35 : 117.68 = 55.79 : x
  2. Step 2: Convert to fraction form
    85.35/117.68 = 55.79/x
  3. Step 3: Cross multiply
    85.35x = 117.68 × 55.79
  4. Step 4: Simplify right side
    85.35x = 6,565.38
  5. Step 5: Solve for x
    x = 6,565.38/85.35
  6. Step 6: Final answer
    x = 76.92

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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.