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Finding the Fourth Proportional to 646.60, 964.22 and 640.75

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Solution

The fourth proportional to 646.60, 964.22 and 640.75 is: 955.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.60 : 964.22 = 640.75 : x
  2. Step 2: Convert to fraction form
    646.60/964.22 = 640.75/x
  3. Step 3: Cross multiply
    646.60x = 964.22 × 640.75
  4. Step 4: Simplify right side
    646.60x = 617,823.97
  5. Step 5: Solve for x
    x = 617,823.97/646.60
  6. Step 6: Final answer
    x = 955.50

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.