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Finding the Fourth Proportional to 1,015.96, 1,398.82 and 866.32

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Solution

The fourth proportional to 1,015.96, 1,398.82 and 866.32 is: 1,192.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,015.96 : 1,398.82 = 866.32 : x
  2. Step 2: Convert to fraction form
    1,015.96/1,398.82 = 866.32/x
  3. Step 3: Cross multiply
    1,015.96x = 1,398.82 × 866.32
  4. Step 4: Simplify right side
    1,015.96x = 1,211,825.74
  5. Step 5: Solve for x
    x = 1,211,825.74/1,015.96
  6. Step 6: Final answer
    x = 1,192.79

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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.