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Finding the Fourth Proportional to 1,270.62, 1,906.92 and 612.63

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Solution

The fourth proportional to 1,270.62, 1,906.92 and 612.63 is: 919.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,270.62 : 1,906.92 = 612.63 : x
  2. Step 2: Convert to fraction form
    1,270.62/1,906.92 = 612.63/x
  3. Step 3: Cross multiply
    1,270.62x = 1,906.92 × 612.63
  4. Step 4: Simplify right side
    1,270.62x = 1,168,236.40
  5. Step 5: Solve for x
    x = 1,168,236.40/1,270.62
  6. Step 6: Final answer
    x = 919.42

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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.