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Finding the Fourth Proportional to 664.48, 917.07 and 478.58

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Solution

The fourth proportional to 664.48, 917.07 and 478.58 is: 660.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.48 : 917.07 = 478.58 : x
  2. Step 2: Convert to fraction form
    664.48/917.07 = 478.58/x
  3. Step 3: Cross multiply
    664.48x = 917.07 × 478.58
  4. Step 4: Simplify right side
    664.48x = 438,891.36
  5. Step 5: Solve for x
    x = 438,891.36/664.48
  6. Step 6: Final answer
    x = 660.50

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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.