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Finding the Fourth Proportional to 781.39, 1,071.32 and 767.62

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Solution

The fourth proportional to 781.39, 1,071.32 and 767.62 is: 1,052.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    781.39 : 1,071.32 = 767.62 : x
  2. Step 2: Convert to fraction form
    781.39/1,071.32 = 767.62/x
  3. Step 3: Cross multiply
    781.39x = 1,071.32 × 767.62
  4. Step 4: Simplify right side
    781.39x = 822,361.30
  5. Step 5: Solve for x
    x = 822,361.30/781.39
  6. Step 6: Final answer
    x = 1,052.44

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.