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Finding the Fourth Proportional to 192.46, 288.63 and 70.78

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Solution

The fourth proportional to 192.46, 288.63 and 70.78 is: 106.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    192.46 : 288.63 = 70.78 : x
  2. Step 2: Convert to fraction form
    192.46/288.63 = 70.78/x
  3. Step 3: Cross multiply
    192.46x = 288.63 × 70.78
  4. Step 4: Simplify right side
    192.46x = 20,429.23
  5. Step 5: Solve for x
    x = 20,429.23/192.46
  6. Step 6: Final answer
    x = 106.15

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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.