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Finding the Fourth Proportional to 1,006, 1,387.81 and 711.43

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Solution

The fourth proportional to 1,006, 1,387.81 and 711.43 is: 981.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,006 : 1,387.81 = 711.43 : x
  2. Step 2: Convert to fraction form
    1,006/1,387.81 = 711.43/x
  3. Step 3: Cross multiply
    1,006x = 1,387.81 × 711.43
  4. Step 4: Simplify right side
    1,006x = 987,327.89
  5. Step 5: Solve for x
    x = 987,327.89/1,006
  6. Step 6: Final answer
    x = 981.44

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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.