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Finding the Fourth Proportional to 696.63, 1,043.86 and 388.29

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Solution

The fourth proportional to 696.63, 1,043.86 and 388.29 is: 581.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    696.63 : 1,043.86 = 388.29 : x
  2. Step 2: Convert to fraction form
    696.63/1,043.86 = 388.29/x
  3. Step 3: Cross multiply
    696.63x = 1,043.86 × 388.29
  4. Step 4: Simplify right side
    696.63x = 405,320.40
  5. Step 5: Solve for x
    x = 405,320.40/696.63
  6. Step 6: Final answer
    x = 581.83

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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.