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Finding the Fourth Proportional to 768.72, 1,152 and 624

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Solution

The fourth proportional to 768.72, 1,152 and 624 is: 935.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.72 : 1,152 = 624 : x
  2. Step 2: Convert to fraction form
    768.72/1,152 = 624/x
  3. Step 3: Cross multiply
    768.72x = 1,152 × 624
  4. Step 4: Simplify right side
    768.72x = 718,848
  5. Step 5: Solve for x
    x = 718,848/768.72
  6. Step 6: Final answer
    x = 935.12

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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.