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Finding the Fourth Proportional to 767.42, 1,151.50 and 328.54

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Solution

The fourth proportional to 767.42, 1,151.50 and 328.54 is: 492.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    767.42 : 1,151.50 = 328.54 : x
  2. Step 2: Convert to fraction form
    767.42/1,151.50 = 328.54/x
  3. Step 3: Cross multiply
    767.42x = 1,151.50 × 328.54
  4. Step 4: Simplify right side
    767.42x = 378,313.81
  5. Step 5: Solve for x
    x = 378,313.81/767.42
  6. Step 6: Final answer
    x = 492.97

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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.