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Finding the Fourth Proportional to 74.86, 103.21 and 66.16

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Solution

The fourth proportional to 74.86, 103.21 and 66.16 is: 91.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.86 : 103.21 = 66.16 : x
  2. Step 2: Convert to fraction form
    74.86/103.21 = 66.16/x
  3. Step 3: Cross multiply
    74.86x = 103.21 × 66.16
  4. Step 4: Simplify right side
    74.86x = 6,828.37
  5. Step 5: Solve for x
    x = 6,828.37/74.86
  6. Step 6: Final answer
    x = 91.22

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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.