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Finding the Fourth Proportional to 645.60, 962.73 and 639.75

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Solution

The fourth proportional to 645.60, 962.73 and 639.75 is: 954.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.60 : 962.73 = 639.75 : x
  2. Step 2: Convert to fraction form
    645.60/962.73 = 639.75/x
  3. Step 3: Cross multiply
    645.60x = 962.73 × 639.75
  4. Step 4: Simplify right side
    645.60x = 615,906.52
  5. Step 5: Solve for x
    x = 615,906.52/645.60
  6. Step 6: Final answer
    x = 954.01

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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.