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Finding the Fourth Proportional to 656.36, 984.60 and 639.08

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Solution

The fourth proportional to 656.36, 984.60 and 639.08 is: 958.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    656.36 : 984.60 = 639.08 : x
  2. Step 2: Convert to fraction form
    656.36/984.60 = 639.08/x
  3. Step 3: Cross multiply
    656.36x = 984.60 × 639.08
  4. Step 4: Simplify right side
    656.36x = 629,238.17
  5. Step 5: Solve for x
    x = 629,238.17/656.36
  6. Step 6: Final answer
    x = 958.68

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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.