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Finding the Fourth Proportional to 78.74, 118.07 and 57.08

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Solution

The fourth proportional to 78.74, 118.07 and 57.08 is: 85.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.74 : 118.07 = 57.08 : x
  2. Step 2: Convert to fraction form
    78.74/118.07 = 57.08/x
  3. Step 3: Cross multiply
    78.74x = 118.07 × 57.08
  4. Step 4: Simplify right side
    78.74x = 6,739.44
  5. Step 5: Solve for x
    x = 6,739.44/78.74
  6. Step 6: Final answer
    x = 85.59

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.