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Finding the Fourth Proportional to 1,002.12, 1,382.82 and 609

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Solution

The fourth proportional to 1,002.12, 1,382.82 and 609 is: 840.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,002.12 : 1,382.82 = 609 : x
  2. Step 2: Convert to fraction form
    1,002.12/1,382.82 = 609/x
  3. Step 3: Cross multiply
    1,002.12x = 1,382.82 × 609
  4. Step 4: Simplify right side
    1,002.12x = 842,137.38
  5. Step 5: Solve for x
    x = 842,137.38/1,002.12
  6. Step 6: Final answer
    x = 840.36

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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.