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Finding the Fourth Proportional to 1,015.85, 1,402.11 and 721.21

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Solution

The fourth proportional to 1,015.85, 1,402.11 and 721.21 is: 995.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,015.85 : 1,402.11 = 721.21 : x
  2. Step 2: Convert to fraction form
    1,015.85/1,402.11 = 721.21/x
  3. Step 3: Cross multiply
    1,015.85x = 1,402.11 × 721.21
  4. Step 4: Simplify right side
    1,015.85x = 1,011,215.75
  5. Step 5: Solve for x
    x = 1,011,215.75/1,015.85
  6. Step 6: Final answer
    x = 995.44

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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.