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Finding the Fourth Proportional to 800.50, 1,200.75 and 192.50

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Solution

The fourth proportional to 800.50, 1,200.75 and 192.50 is: 288.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    800.50 : 1,200.75 = 192.50 : x
  2. Step 2: Convert to fraction form
    800.50/1,200.75 = 192.50/x
  3. Step 3: Cross multiply
    800.50x = 1,200.75 × 192.50
  4. Step 4: Simplify right side
    800.50x = 231,144.38
  5. Step 5: Solve for x
    x = 231,144.38/800.50
  6. Step 6: Final answer
    x = 288.75

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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.