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Finding the Fourth Proportional to 72.77, 108.58 and 66.30

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Solution

The fourth proportional to 72.77, 108.58 and 66.30 is: 98.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.77 : 108.58 = 66.30 : x
  2. Step 2: Convert to fraction form
    72.77/108.58 = 66.30/x
  3. Step 3: Cross multiply
    72.77x = 108.58 × 66.30
  4. Step 4: Simplify right side
    72.77x = 7,198.53
  5. Step 5: Solve for x
    x = 7,198.53/72.77
  6. Step 6: Final answer
    x = 98.93

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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.