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Finding the Fourth Proportional to 664.48, 917.41 and 455.01

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Solution

The fourth proportional to 664.48, 917.41 and 455.01 is: 628.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.48 : 917.41 = 455.01 : x
  2. Step 2: Convert to fraction form
    664.48/917.41 = 455.01/x
  3. Step 3: Cross multiply
    664.48x = 917.41 × 455.01
  4. Step 4: Simplify right side
    664.48x = 417,430.72
  5. Step 5: Solve for x
    x = 417,430.72/664.48
  6. Step 6: Final answer
    x = 628.21

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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.