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Finding the Fourth Proportional to 768.25, 1,152.74 and 403.21

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Solution

The fourth proportional to 768.25, 1,152.74 and 403.21 is: 605.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.25 : 1,152.74 = 403.21 : x
  2. Step 2: Convert to fraction form
    768.25/1,152.74 = 403.21/x
  3. Step 3: Cross multiply
    768.25x = 1,152.74 × 403.21
  4. Step 4: Simplify right side
    768.25x = 464,796.30
  5. Step 5: Solve for x
    x = 464,796.30/768.25
  6. Step 6: Final answer
    x = 605.01

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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.