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Finding the Fourth Proportional to 72.68, 109.02 and 66.56

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Solution

The fourth proportional to 72.68, 109.02 and 66.56 is: 99.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.68 : 109.02 = 66.56 : x
  2. Step 2: Convert to fraction form
    72.68/109.02 = 66.56/x
  3. Step 3: Cross multiply
    72.68x = 109.02 × 66.56
  4. Step 4: Simplify right side
    72.68x = 7,256.37
  5. Step 5: Solve for x
    x = 7,256.37/72.68
  6. Step 6: Final answer
    x = 99.84

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.