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Finding the Fourth Proportional to 649.29, 899.79 and 636.99

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Solution

The fourth proportional to 649.29, 899.79 and 636.99 is: 882.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    649.29 : 899.79 = 636.99 : x
  2. Step 2: Convert to fraction form
    649.29/899.79 = 636.99/x
  3. Step 3: Cross multiply
    649.29x = 899.79 × 636.99
  4. Step 4: Simplify right side
    649.29x = 573,151.47
  5. Step 5: Solve for x
    x = 573,151.47/649.29
  6. Step 6: Final answer
    x = 882.73

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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.