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Finding the Fourth Proportional to 1,006.39, 1,388.62 and 727.05

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Solution

The fourth proportional to 1,006.39, 1,388.62 and 727.05 is: 1,003.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,006.39 : 1,388.62 = 727.05 : x
  2. Step 2: Convert to fraction form
    1,006.39/1,388.62 = 727.05/x
  3. Step 3: Cross multiply
    1,006.39x = 1,388.62 × 727.05
  4. Step 4: Simplify right side
    1,006.39x = 1,009,596.17
  5. Step 5: Solve for x
    x = 1,009,596.17/1,006.39
  6. Step 6: Final answer
    x = 1,003.19

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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.