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Finding the Fourth Proportional to 74.99, 112.89 and 67.55

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Solution

The fourth proportional to 74.99, 112.89 and 67.55 is: 101.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.99 : 112.89 = 67.55 : x
  2. Step 2: Convert to fraction form
    74.99/112.89 = 67.55/x
  3. Step 3: Cross multiply
    74.99x = 112.89 × 67.55
  4. Step 4: Simplify right side
    74.99x = 7,625.72
  5. Step 5: Solve for x
    x = 7,625.72/74.99
  6. Step 6: Final answer
    x = 101.69

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.