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Finding the Fourth Proportional to 664.48, 917.26 and 448.93

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Solution

The fourth proportional to 664.48, 917.26 and 448.93 is: 619.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.48 : 917.26 = 448.93 : x
  2. Step 2: Convert to fraction form
    664.48/917.26 = 448.93/x
  3. Step 3: Cross multiply
    664.48x = 917.26 × 448.93
  4. Step 4: Simplify right side
    664.48x = 411,785.56
  5. Step 5: Solve for x
    x = 411,785.56/664.48
  6. Step 6: Final answer
    x = 619.71

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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.