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Finding the Fourth Proportional to 768.72, 1,152.81 and 248.70

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Solution

The fourth proportional to 768.72, 1,152.81 and 248.70 is: 372.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.72 : 1,152.81 = 248.70 : x
  2. Step 2: Convert to fraction form
    768.72/1,152.81 = 248.70/x
  3. Step 3: Cross multiply
    768.72x = 1,152.81 × 248.70
  4. Step 4: Simplify right side
    768.72x = 286,703.85
  5. Step 5: Solve for x
    x = 286,703.85/768.72
  6. Step 6: Final answer
    x = 372.96

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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.