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Finding the Fourth Proportional to 1,033.08, 1,425.78 and 640.26

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Solution

The fourth proportional to 1,033.08, 1,425.78 and 640.26 is: 883.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,033.08 : 1,425.78 = 640.26 : x
  2. Step 2: Convert to fraction form
    1,033.08/1,425.78 = 640.26/x
  3. Step 3: Cross multiply
    1,033.08x = 1,425.78 × 640.26
  4. Step 4: Simplify right side
    1,033.08x = 912,869.90
  5. Step 5: Solve for x
    x = 912,869.90/1,033.08
  6. Step 6: Final answer
    x = 883.64

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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.