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Finding the Fourth Proportional to 76.62, 115.06 and 72.92

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Solution

The fourth proportional to 76.62, 115.06 and 72.92 is: 109.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.62 : 115.06 = 72.92 : x
  2. Step 2: Convert to fraction form
    76.62/115.06 = 72.92/x
  3. Step 3: Cross multiply
    76.62x = 115.06 × 72.92
  4. Step 4: Simplify right side
    76.62x = 8,390.18
  5. Step 5: Solve for x
    x = 8,390.18/76.62
  6. Step 6: Final answer
    x = 109.50

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.