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Finding the Fourth Proportional to 768.52, 1,152.77 and 427.24

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Solution

The fourth proportional to 768.52, 1,152.77 and 427.24 is: 640.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.52 : 1,152.77 = 427.24 : x
  2. Step 2: Convert to fraction form
    768.52/1,152.77 = 427.24/x
  3. Step 3: Cross multiply
    768.52x = 1,152.77 × 427.24
  4. Step 4: Simplify right side
    768.52x = 492,504.76
  5. Step 5: Solve for x
    x = 492,504.76/768.52
  6. Step 6: Final answer
    x = 640.85

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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.