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Finding the Fourth Proportional to 74.51, 102.61 and 72.91

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Solution

The fourth proportional to 74.51, 102.61 and 72.91 is: 100.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.51 : 102.61 = 72.91 : x
  2. Step 2: Convert to fraction form
    74.51/102.61 = 72.91/x
  3. Step 3: Cross multiply
    74.51x = 102.61 × 72.91
  4. Step 4: Simplify right side
    74.51x = 7,481.30
  5. Step 5: Solve for x
    x = 7,481.30/74.51
  6. Step 6: Final answer
    x = 100.41

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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.