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Finding the Fourth Proportional to 2,631.14, 3,946.02 and 781.76

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Solution

The fourth proportional to 2,631.14, 3,946.02 and 781.76 is: 1,172.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,631.14 : 3,946.02 = 781.76 : x
  2. Step 2: Convert to fraction form
    2,631.14/3,946.02 = 781.76/x
  3. Step 3: Cross multiply
    2,631.14x = 3,946.02 × 781.76
  4. Step 4: Simplify right side
    2,631.14x = 3,084,829.73
  5. Step 5: Solve for x
    x = 3,084,829.73/2,631.14
  6. Step 6: Final answer
    x = 1,172.43

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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.