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Finding the Fourth Proportional to 1,012.82, 1,519.22 and 947.21

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Solution

The fourth proportional to 1,012.82, 1,519.22 and 947.21 is: 1,420.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,012.82 : 1,519.22 = 947.21 : x
  2. Step 2: Convert to fraction form
    1,012.82/1,519.22 = 947.21/x
  3. Step 3: Cross multiply
    1,012.82x = 1,519.22 × 947.21
  4. Step 4: Simplify right side
    1,012.82x = 1,439,015.15
  5. Step 5: Solve for x
    x = 1,439,015.15/1,012.82
  6. Step 6: Final answer
    x = 1,420.81

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.