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Finding the Fourth Proportional to 192.50, 288.70 and 89.68

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Solution

The fourth proportional to 192.50, 288.70 and 89.68 is: 134.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    192.50 : 288.70 = 89.68 : x
  2. Step 2: Convert to fraction form
    192.50/288.70 = 89.68/x
  3. Step 3: Cross multiply
    192.50x = 288.70 × 89.68
  4. Step 4: Simplify right side
    192.50x = 25,891.34
  5. Step 5: Solve for x
    x = 25,891.34/192.50
  6. Step 6: Final answer
    x = 134.50

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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.