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Finding the Fourth Proportional to 664.67, 917.19 and 384.98

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Solution

The fourth proportional to 664.67, 917.19 and 384.98 is: 531.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.67 : 917.19 = 384.98 : x
  2. Step 2: Convert to fraction form
    664.67/917.19 = 384.98/x
  3. Step 3: Cross multiply
    664.67x = 917.19 × 384.98
  4. Step 4: Simplify right side
    664.67x = 353,095.22
  5. Step 5: Solve for x
    x = 353,095.22/664.67
  6. Step 6: Final answer
    x = 531.23

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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.