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Finding the Fourth Proportional to 1,225.32, 1,690.82 and 727.90

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Solution

The fourth proportional to 1,225.32, 1,690.82 and 727.90 is: 1,004.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,225.32 : 1,690.82 = 727.90 : x
  2. Step 2: Convert to fraction form
    1,225.32/1,690.82 = 727.90/x
  3. Step 3: Cross multiply
    1,225.32x = 1,690.82 × 727.90
  4. Step 4: Simplify right side
    1,225.32x = 1,230,747.88
  5. Step 5: Solve for x
    x = 1,230,747.88/1,225.32
  6. Step 6: Final answer
    x = 1,004.43

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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.