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Finding the Fourth Proportional to 1,086.66, 1,629.81 and 306.78

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Solution

The fourth proportional to 1,086.66, 1,629.81 and 306.78 is: 460.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,086.66 : 1,629.81 = 306.78 : x
  2. Step 2: Convert to fraction form
    1,086.66/1,629.81 = 306.78/x
  3. Step 3: Cross multiply
    1,086.66x = 1,629.81 × 306.78
  4. Step 4: Simplify right side
    1,086.66x = 499,993.11
  5. Step 5: Solve for x
    x = 499,993.11/1,086.66
  6. Step 6: Final answer
    x = 460.12

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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.