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Finding the Fourth Proportional to 74.86, 111.71 and 66.20

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Solution

The fourth proportional to 74.86, 111.71 and 66.20 is: 98.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.86 : 111.71 = 66.20 : x
  2. Step 2: Convert to fraction form
    74.86/111.71 = 66.20/x
  3. Step 3: Cross multiply
    74.86x = 111.71 × 66.20
  4. Step 4: Simplify right side
    74.86x = 7,395.06
  5. Step 5: Solve for x
    x = 7,395.06/74.86
  6. Step 6: Final answer
    x = 98.79

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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.