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Finding the Fourth Proportional to 85.61, 118.03 and 57.92

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Solution

The fourth proportional to 85.61, 118.03 and 57.92 is: 79.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.61 : 118.03 = 57.92 : x
  2. Step 2: Convert to fraction form
    85.61/118.03 = 57.92/x
  3. Step 3: Cross multiply
    85.61x = 118.03 × 57.92
  4. Step 4: Simplify right side
    85.61x = 6,835.42
  5. Step 5: Solve for x
    x = 6,835.42/85.61
  6. Step 6: Final answer
    x = 79.85

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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.