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Finding the Fourth Proportional to 768.75, 1,153.53 and 330.21

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Solution

The fourth proportional to 768.75, 1,153.53 and 330.21 is: 495.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.75 : 1,153.53 = 330.21 : x
  2. Step 2: Convert to fraction form
    768.75/1,153.53 = 330.21/x
  3. Step 3: Cross multiply
    768.75x = 1,153.53 × 330.21
  4. Step 4: Simplify right side
    768.75x = 380,911.54
  5. Step 5: Solve for x
    x = 380,911.54/768.75
  6. Step 6: Final answer
    x = 495.49

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1.5x scale

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.