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Finding the Fourth Proportional to 85.44, 117.93 and 57.83

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Solution

The fourth proportional to 85.44, 117.93 and 57.83 is: 79.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.44 : 117.93 = 57.83 : x
  2. Step 2: Convert to fraction form
    85.44/117.93 = 57.83/x
  3. Step 3: Cross multiply
    85.44x = 117.93 × 57.83
  4. Step 4: Simplify right side
    85.44x = 6,819.89
  5. Step 5: Solve for x
    x = 6,819.89/85.44
  6. Step 6: Final answer
    x = 79.82

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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.