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Finding the Fourth Proportional to 72.63, 109.53 and 66.69

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Solution

The fourth proportional to 72.63, 109.53 and 66.69 is: 100.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.63 : 109.53 = 66.69 : x
  2. Step 2: Convert to fraction form
    72.63/109.53 = 66.69/x
  3. Step 3: Cross multiply
    72.63x = 109.53 × 66.69
  4. Step 4: Simplify right side
    72.63x = 7,304.56
  5. Step 5: Solve for x
    x = 7,304.56/72.63
  6. Step 6: Final answer
    x = 100.57

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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.