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Finding the Fourth Proportional to 768.19, 1,153.45 and 613.66

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Solution

The fourth proportional to 768.19, 1,153.45 and 613.66 is: 921.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.19 : 1,153.45 = 613.66 : x
  2. Step 2: Convert to fraction form
    768.19/1,153.45 = 613.66/x
  3. Step 3: Cross multiply
    768.19x = 1,153.45 × 613.66
  4. Step 4: Simplify right side
    768.19x = 707,824.45
  5. Step 5: Solve for x
    x = 707,824.45/768.19
  6. Step 6: Final answer
    x = 921.42

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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.