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Finding the Fourth Proportional to 640.40, 960.60 and 626.90

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Solution

The fourth proportional to 640.40, 960.60 and 626.90 is: 940.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.40 : 960.60 = 626.90 : x
  2. Step 2: Convert to fraction form
    640.40/960.60 = 626.90/x
  3. Step 3: Cross multiply
    640.40x = 960.60 × 626.90
  4. Step 4: Simplify right side
    640.40x = 602,200.14
  5. Step 5: Solve for x
    x = 602,200.14/640.40
  6. Step 6: Final answer
    x = 940.35

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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.