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Finding the Fourth Proportional to 74.05, 111.47 and 66.11

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Solution

The fourth proportional to 74.05, 111.47 and 66.11 is: 99.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.05 : 111.47 = 66.11 : x
  2. Step 2: Convert to fraction form
    74.05/111.47 = 66.11/x
  3. Step 3: Cross multiply
    74.05x = 111.47 × 66.11
  4. Step 4: Simplify right side
    74.05x = 7,368.39
  5. Step 5: Solve for x
    x = 7,368.39/74.05
  6. Step 6: Final answer
    x = 99.51

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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.