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Finding the Fourth Proportional to 767.20, 1,150.78 and 190.08

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Solution

The fourth proportional to 767.20, 1,150.78 and 190.08 is: 285.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    767.20 : 1,150.78 = 190.08 : x
  2. Step 2: Convert to fraction form
    767.20/1,150.78 = 190.08/x
  3. Step 3: Cross multiply
    767.20x = 1,150.78 × 190.08
  4. Step 4: Simplify right side
    767.20x = 218,740.26
  5. Step 5: Solve for x
    x = 218,740.26/767.20
  6. Step 6: Final answer
    x = 285.12

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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.