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Finding the Fourth Proportional to 900.98, 1,351.28 and 640.25

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Solution

The fourth proportional to 900.98, 1,351.28 and 640.25 is: 960.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.98 : 1,351.28 = 640.25 : x
  2. Step 2: Convert to fraction form
    900.98/1,351.28 = 640.25/x
  3. Step 3: Cross multiply
    900.98x = 1,351.28 × 640.25
  4. Step 4: Simplify right side
    900.98x = 865,147.06
  5. Step 5: Solve for x
    x = 865,147.06/900.98
  6. Step 6: Final answer
    x = 960.23

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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.