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Finding the Fourth Proportional to 1,011.85, 1,396.49 and 949.30

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Solution

The fourth proportional to 1,011.85, 1,396.49 and 949.30 is: 1,310.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,011.85 : 1,396.49 = 949.30 : x
  2. Step 2: Convert to fraction form
    1,011.85/1,396.49 = 949.30/x
  3. Step 3: Cross multiply
    1,011.85x = 1,396.49 × 949.30
  4. Step 4: Simplify right side
    1,011.85x = 1,325,693.82
  5. Step 5: Solve for x
    x = 1,325,693.82/1,011.85
  6. Step 6: Final answer
    x = 1,310.17

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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.