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Finding the Fourth Proportional to 768.96, 1,153.40 and 255.96

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Solution

The fourth proportional to 768.96, 1,153.40 and 255.96 is: 383.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.96 : 1,153.40 = 255.96 : x
  2. Step 2: Convert to fraction form
    768.96/1,153.40 = 255.96/x
  3. Step 3: Cross multiply
    768.96x = 1,153.40 × 255.96
  4. Step 4: Simplify right side
    768.96x = 295,222.98
  5. Step 5: Solve for x
    x = 295,222.98/768.96
  6. Step 6: Final answer
    x = 383.93

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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.