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Finding the Fourth Proportional to 192.76, 289.14 and 128.50

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Solution

The fourth proportional to 192.76, 289.14 and 128.50 is: 192.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    192.76 : 289.14 = 128.50 : x
  2. Step 2: Convert to fraction form
    192.76/289.14 = 128.50/x
  3. Step 3: Cross multiply
    192.76x = 289.14 × 128.50
  4. Step 4: Simplify right side
    192.76x = 37,154.49
  5. Step 5: Solve for x
    x = 37,154.49/192.76
  6. Step 6: Final answer
    x = 192.75

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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.