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Finding the Fourth Proportional to 694.64, 1,039.52 and 511.58

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Solution

The fourth proportional to 694.64, 1,039.52 and 511.58 is: 765.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    694.64 : 1,039.52 = 511.58 : x
  2. Step 2: Convert to fraction form
    694.64/1,039.52 = 511.58/x
  3. Step 3: Cross multiply
    694.64x = 1,039.52 × 511.58
  4. Step 4: Simplify right side
    694.64x = 531,797.64
  5. Step 5: Solve for x
    x = 531,797.64/694.64
  6. Step 6: Final answer
    x = 765.57

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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.