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Finding the Fourth Proportional to 1,215.80, 1,677.78 and 743.70

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Solution

The fourth proportional to 1,215.80, 1,677.78 and 743.70 is: 1,026.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.80 : 1,677.78 = 743.70 : x
  2. Step 2: Convert to fraction form
    1,215.80/1,677.78 = 743.70/x
  3. Step 3: Cross multiply
    1,215.80x = 1,677.78 × 743.70
  4. Step 4: Simplify right side
    1,215.80x = 1,247,771.28
  5. Step 5: Solve for x
    x = 1,247,771.28/1,215.80
  6. Step 6: Final answer
    x = 1,026.29

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.