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Finding the Fourth Proportional to 648.81, 899.13 and 636.50

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Solution

The fourth proportional to 648.81, 899.13 and 636.50 is: 882.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.81 : 899.13 = 636.50 : x
  2. Step 2: Convert to fraction form
    648.81/899.13 = 636.50/x
  3. Step 3: Cross multiply
    648.81x = 899.13 × 636.50
  4. Step 4: Simplify right side
    648.81x = 572,296.25
  5. Step 5: Solve for x
    x = 572,296.25/648.81
  6. Step 6: Final answer
    x = 882.07

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.