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Finding the Fourth Proportional to 1,334.11, 1,998.69 and 685.30

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Solution

The fourth proportional to 1,334.11, 1,998.69 and 685.30 is: 1,026.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,334.11 : 1,998.69 = 685.30 : x
  2. Step 2: Convert to fraction form
    1,334.11/1,998.69 = 685.30/x
  3. Step 3: Cross multiply
    1,334.11x = 1,998.69 × 685.30
  4. Step 4: Simplify right side
    1,334.11x = 1,369,702.26
  5. Step 5: Solve for x
    x = 1,369,702.26/1,334.11
  6. Step 6: Final answer
    x = 1,026.68

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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.