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Finding the Fourth Proportional to 664.32, 917.13 and 440.28

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Solution

The fourth proportional to 664.32, 917.13 and 440.28 is: 607.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.32 : 917.13 = 440.28 : x
  2. Step 2: Convert to fraction form
    664.32/917.13 = 440.28/x
  3. Step 3: Cross multiply
    664.32x = 917.13 × 440.28
  4. Step 4: Simplify right side
    664.32x = 403,794.00
  5. Step 5: Solve for x
    x = 403,794.00/664.32
  6. Step 6: Final answer
    x = 607.83

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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.