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Finding the Fourth Proportional to 1,015.66, 1,401.96 and 721.79

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Solution

The fourth proportional to 1,015.66, 1,401.96 and 721.79 is: 996.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,015.66 : 1,401.96 = 721.79 : x
  2. Step 2: Convert to fraction form
    1,015.66/1,401.96 = 721.79/x
  3. Step 3: Cross multiply
    1,015.66x = 1,401.96 × 721.79
  4. Step 4: Simplify right side
    1,015.66x = 1,011,913.66
  5. Step 5: Solve for x
    x = 1,011,913.66/1,015.66
  6. Step 6: Final answer
    x = 996.31

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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.