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Finding the Fourth Proportional to 648.06, 888.48 and 636.40

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Solution

The fourth proportional to 648.06, 888.48 and 636.40 is: 872.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.06 : 888.48 = 636.40 : x
  2. Step 2: Convert to fraction form
    648.06/888.48 = 636.40/x
  3. Step 3: Cross multiply
    648.06x = 888.48 × 636.40
  4. Step 4: Simplify right side
    648.06x = 565,430.26
  5. Step 5: Solve for x
    x = 565,430.26/648.06
  6. Step 6: Final answer
    x = 872.50

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.