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Finding the Fourth Proportional to 85.74, 118.46 and 77.93

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Solution

The fourth proportional to 85.74, 118.46 and 77.93 is: 107.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.74 : 118.46 = 77.93 : x
  2. Step 2: Convert to fraction form
    85.74/118.46 = 77.93/x
  3. Step 3: Cross multiply
    85.74x = 118.46 × 77.93
  4. Step 4: Simplify right side
    85.74x = 9,230.61
  5. Step 5: Solve for x
    x = 9,230.61/85.74
  6. Step 6: Final answer
    x = 107.66

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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.