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Finding the Fourth Proportional to 1,006.38, 1,387.56 and 743.94

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Solution

The fourth proportional to 1,006.38, 1,387.56 and 743.94 is: 1,025.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,006.38 : 1,387.56 = 743.94 : x
  2. Step 2: Convert to fraction form
    1,006.38/1,387.56 = 743.94/x
  3. Step 3: Cross multiply
    1,006.38x = 1,387.56 × 743.94
  4. Step 4: Simplify right side
    1,006.38x = 1,032,261.39
  5. Step 5: Solve for x
    x = 1,032,261.39/1,006.38
  6. Step 6: Final answer
    x = 1,025.72

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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.