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Finding the Fourth Proportional to 696.22, 1,043.65 and 387.91

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Solution

The fourth proportional to 696.22, 1,043.65 and 387.91 is: 581.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    696.22 : 1,043.65 = 387.91 : x
  2. Step 2: Convert to fraction form
    696.22/1,043.65 = 387.91/x
  3. Step 3: Cross multiply
    696.22x = 1,043.65 × 387.91
  4. Step 4: Simplify right side
    696.22x = 404,842.27
  5. Step 5: Solve for x
    x = 404,842.27/696.22
  6. Step 6: Final answer
    x = 581.49

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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.