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Finding the Fourth Proportional to 74.79, 102.84 and 72.63

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Solution

The fourth proportional to 74.79, 102.84 and 72.63 is: 99.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.79 : 102.84 = 72.63 : x
  2. Step 2: Convert to fraction form
    74.79/102.84 = 72.63/x
  3. Step 3: Cross multiply
    74.79x = 102.84 × 72.63
  4. Step 4: Simplify right side
    74.79x = 7,469.27
  5. Step 5: Solve for x
    x = 7,469.27/74.79
  6. Step 6: Final answer
    x = 99.87

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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.