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Finding the Fourth Proportional to 72.69, 100.35 and 61.62

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Solution

The fourth proportional to 72.69, 100.35 and 61.62 is: 85.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.69 : 100.35 = 61.62 : x
  2. Step 2: Convert to fraction form
    72.69/100.35 = 61.62/x
  3. Step 3: Cross multiply
    72.69x = 100.35 × 61.62
  4. Step 4: Simplify right side
    72.69x = 6,183.57
  5. Step 5: Solve for x
    x = 6,183.57/72.69
  6. Step 6: Final answer
    x = 85.07

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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.