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Finding the Fourth Proportional to 768.80, 1,153.28 and 335.90

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Solution

The fourth proportional to 768.80, 1,153.28 and 335.90 is: 503.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.80 : 1,153.28 = 335.90 : x
  2. Step 2: Convert to fraction form
    768.80/1,153.28 = 335.90/x
  3. Step 3: Cross multiply
    768.80x = 1,153.28 × 335.90
  4. Step 4: Simplify right side
    768.80x = 387,381.83
  5. Step 5: Solve for x
    x = 387,381.83/768.80
  6. Step 6: Final answer
    x = 503.88

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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.