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Finding the Fourth Proportional to 76.14, 105.20 and 72.39

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Solution

The fourth proportional to 76.14, 105.20 and 72.39 is: 100.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.14 : 105.20 = 72.39 : x
  2. Step 2: Convert to fraction form
    76.14/105.20 = 72.39/x
  3. Step 3: Cross multiply
    76.14x = 105.20 × 72.39
  4. Step 4: Simplify right side
    76.14x = 7,615.07
  5. Step 5: Solve for x
    x = 7,615.07/76.14
  6. Step 6: Final answer
    x = 100.01

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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.