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Finding the Fourth Proportional to 77.74, 107.01 and 74.98

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Solution

The fourth proportional to 77.74, 107.01 and 74.98 is: 103.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.74 : 107.01 = 74.98 : x
  2. Step 2: Convert to fraction form
    77.74/107.01 = 74.98/x
  3. Step 3: Cross multiply
    77.74x = 107.01 × 74.98
  4. Step 4: Simplify right side
    77.74x = 8,023.61
  5. Step 5: Solve for x
    x = 8,023.61/77.74
  6. Step 6: Final answer
    x = 103.21

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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.