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Finding the Fourth Proportional to 1,033.74, 1,426.86 and 640.89

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Solution

The fourth proportional to 1,033.74, 1,426.86 and 640.89 is: 884.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,033.74 : 1,426.86 = 640.89 : x
  2. Step 2: Convert to fraction form
    1,033.74/1,426.86 = 640.89/x
  3. Step 3: Cross multiply
    1,033.74x = 1,426.86 × 640.89
  4. Step 4: Simplify right side
    1,033.74x = 914,460.31
  5. Step 5: Solve for x
    x = 914,460.31/1,033.74
  6. Step 6: Final answer
    x = 884.61

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.