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Finding the Fourth Proportional to 1,015.21, 1,400.99 and 549.46

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Solution

The fourth proportional to 1,015.21, 1,400.99 and 549.46 is: 758.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,015.21 : 1,400.99 = 549.46 : x
  2. Step 2: Convert to fraction form
    1,015.21/1,400.99 = 549.46/x
  3. Step 3: Cross multiply
    1,015.21x = 1,400.99 × 549.46
  4. Step 4: Simplify right side
    1,015.21x = 769,778.21
  5. Step 5: Solve for x
    x = 769,778.21/1,015.21
  6. Step 6: Final answer
    x = 758.25

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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.