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Finding the Fourth Proportional to 192.61, 288.74 and 76.99

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Solution

The fourth proportional to 192.61, 288.74 and 76.99 is: 115.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    192.61 : 288.74 = 76.99 : x
  2. Step 2: Convert to fraction form
    192.61/288.74 = 76.99/x
  3. Step 3: Cross multiply
    192.61x = 288.74 × 76.99
  4. Step 4: Simplify right side
    192.61x = 22,229.71
  5. Step 5: Solve for x
    x = 22,229.71/192.61
  6. Step 6: Final answer
    x = 115.42

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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.