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Finding the Fourth Proportional to 72.92, 100.49 and 61.26

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Solution

The fourth proportional to 72.92, 100.49 and 61.26 is: 84.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.92 : 100.49 = 61.26 : x
  2. Step 2: Convert to fraction form
    72.92/100.49 = 61.26/x
  3. Step 3: Cross multiply
    72.92x = 100.49 × 61.26
  4. Step 4: Simplify right side
    72.92x = 6,155.71
  5. Step 5: Solve for x
    x = 6,155.71/72.92
  6. Step 6: Final answer
    x = 84.42

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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.