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Finding the Fourth Proportional to 696.63, 1,042.57 and 581.28

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Solution

The fourth proportional to 696.63, 1,042.57 and 581.28 is: 869.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    696.63 : 1,042.57 = 581.28 : x
  2. Step 2: Convert to fraction form
    696.63/1,042.57 = 581.28/x
  3. Step 3: Cross multiply
    696.63x = 1,042.57 × 581.28
  4. Step 4: Simplify right side
    696.63x = 606,025.09
  5. Step 5: Solve for x
    x = 606,025.09/696.63
  6. Step 6: Final answer
    x = 869.94

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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.