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Finding the Fourth Proportional to 72.57, 100.14 and 47.97

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Solution

The fourth proportional to 72.57, 100.14 and 47.97 is: 66.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.57 : 100.14 = 47.97 : x
  2. Step 2: Convert to fraction form
    72.57/100.14 = 47.97/x
  3. Step 3: Cross multiply
    72.57x = 100.14 × 47.97
  4. Step 4: Simplify right side
    72.57x = 4,803.72
  5. Step 5: Solve for x
    x = 4,803.72/72.57
  6. Step 6: Final answer
    x = 66.19

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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.