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Finding the Fourth Proportional to 192.57, 288.64 and 138.70

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Solution

The fourth proportional to 192.57, 288.64 and 138.70 is: 207.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    192.57 : 288.64 = 138.70 : x
  2. Step 2: Convert to fraction form
    192.57/288.64 = 138.70/x
  3. Step 3: Cross multiply
    192.57x = 288.64 × 138.70
  4. Step 4: Simplify right side
    192.57x = 40,034.37
  5. Step 5: Solve for x
    x = 40,034.37/192.57
  6. Step 6: Final answer
    x = 207.90

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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.