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Finding the Fourth Proportional to 1,226.03, 1,691.93 and 728.69

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Solution

The fourth proportional to 1,226.03, 1,691.93 and 728.69 is: 1,005.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,226.03 : 1,691.93 = 728.69 : x
  2. Step 2: Convert to fraction form
    1,226.03/1,691.93 = 728.69/x
  3. Step 3: Cross multiply
    1,226.03x = 1,691.93 × 728.69
  4. Step 4: Simplify right side
    1,226.03x = 1,232,888.83
  5. Step 5: Solve for x
    x = 1,232,888.83/1,226.03
  6. Step 6: Final answer
    x = 1,005.59

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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.