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Finding the Fourth Proportional to 885.75, 1,328.26 and 640.23

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Solution

The fourth proportional to 885.75, 1,328.26 and 640.23 is: 960.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.75 : 1,328.26 = 640.23 : x
  2. Step 2: Convert to fraction form
    885.75/1,328.26 = 640.23/x
  3. Step 3: Cross multiply
    885.75x = 1,328.26 × 640.23
  4. Step 4: Simplify right side
    885.75x = 850,391.90
  5. Step 5: Solve for x
    x = 850,391.90/885.75
  6. Step 6: Final answer
    x = 960.08

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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.