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Finding the Fourth Proportional to 74.94, 111.78 and 73.74

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Solution

The fourth proportional to 74.94, 111.78 and 73.74 is: 109.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.94 : 111.78 = 73.74 : x
  2. Step 2: Convert to fraction form
    74.94/111.78 = 73.74/x
  3. Step 3: Cross multiply
    74.94x = 111.78 × 73.74
  4. Step 4: Simplify right side
    74.94x = 8,242.66
  5. Step 5: Solve for x
    x = 8,242.66/74.94
  6. Step 6: Final answer
    x = 109.99

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.