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Finding the Fourth Proportional to 768.78, 1,153.59 and 713.70

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Solution

The fourth proportional to 768.78, 1,153.59 and 713.70 is: 1,070.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.78 : 1,153.59 = 713.70 : x
  2. Step 2: Convert to fraction form
    768.78/1,153.59 = 713.70/x
  3. Step 3: Cross multiply
    768.78x = 1,153.59 × 713.70
  4. Step 4: Simplify right side
    768.78x = 823,317.18
  5. Step 5: Solve for x
    x = 823,317.18/768.78
  6. Step 6: Final answer
    x = 1,070.94

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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.