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Finding the Fourth Proportional to 1,011.92, 1,396.56 and 619.16

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Solution

The fourth proportional to 1,011.92, 1,396.56 and 619.16 is: 854.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,011.92 : 1,396.56 = 619.16 : x
  2. Step 2: Convert to fraction form
    1,011.92/1,396.56 = 619.16/x
  3. Step 3: Cross multiply
    1,011.92x = 1,396.56 × 619.16
  4. Step 4: Simplify right side
    1,011.92x = 864,694.09
  5. Step 5: Solve for x
    x = 864,694.09/1,011.92
  6. Step 6: Final answer
    x = 854.51

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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.