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Finding the Fourth Proportional to 664.52, 917.14 and 478.62

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Solution

The fourth proportional to 664.52, 917.14 and 478.62 is: 660.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.52 : 917.14 = 478.62 : x
  2. Step 2: Convert to fraction form
    664.52/917.14 = 478.62/x
  3. Step 3: Cross multiply
    664.52x = 917.14 × 478.62
  4. Step 4: Simplify right side
    664.52x = 438,960.35
  5. Step 5: Solve for x
    x = 438,960.35/664.52
  6. Step 6: Final answer
    x = 660.57

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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.