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Finding the Fourth Proportional to 72.92, 100.38 and 72.74

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Solution

The fourth proportional to 72.92, 100.38 and 72.74 is: 100.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.92 : 100.38 = 72.74 : x
  2. Step 2: Convert to fraction form
    72.92/100.38 = 72.74/x
  3. Step 3: Cross multiply
    72.92x = 100.38 × 72.74
  4. Step 4: Simplify right side
    72.92x = 7,301.64
  5. Step 5: Solve for x
    x = 7,301.64/72.92
  6. Step 6: Final answer
    x = 100.13

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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.