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Finding the Fourth Proportional to 2,617.66, 3,927.20 and 768.76

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Solution

The fourth proportional to 2,617.66, 3,927.20 and 768.76 is: 1,153.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,617.66 : 3,927.20 = 768.76 : x
  2. Step 2: Convert to fraction form
    2,617.66/3,927.20 = 768.76/x
  3. Step 3: Cross multiply
    2,617.66x = 3,927.20 × 768.76
  4. Step 4: Simplify right side
    2,617.66x = 3,019,060.61
  5. Step 5: Solve for x
    x = 3,019,060.61/2,617.66
  6. Step 6: Final answer
    x = 1,153.34

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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.