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Finding the Fourth Proportional to 74.02, 110.57 and 66.79

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Solution

The fourth proportional to 74.02, 110.57 and 66.79 is: 99.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.02 : 110.57 = 66.79 : x
  2. Step 2: Convert to fraction form
    74.02/110.57 = 66.79/x
  3. Step 3: Cross multiply
    74.02x = 110.57 × 66.79
  4. Step 4: Simplify right side
    74.02x = 7,384.97
  5. Step 5: Solve for x
    x = 7,384.97/74.02
  6. Step 6: Final answer
    x = 99.77

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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.