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Finding the Fourth Proportional to 656.85, 905.00 and 636.80

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Solution

The fourth proportional to 656.85, 905.00 and 636.80 is: 877.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    656.85 : 905.00 = 636.80 : x
  2. Step 2: Convert to fraction form
    656.85/905.00 = 636.80/x
  3. Step 3: Cross multiply
    656.85x = 905.00 × 636.80
  4. Step 4: Simplify right side
    656.85x = 576,303.08
  5. Step 5: Solve for x
    x = 576,303.08/656.85
  6. Step 6: Final answer
    x = 877.37

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.