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Finding the Fourth Proportional to 664.68, 917.09 and 384.86

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Solution

The fourth proportional to 664.68, 917.09 and 384.86 is: 531.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.68 : 917.09 = 384.86 : x
  2. Step 2: Convert to fraction form
    664.68/917.09 = 384.86/x
  3. Step 3: Cross multiply
    664.68x = 917.09 × 384.86
  4. Step 4: Simplify right side
    664.68x = 352,946.67
  5. Step 5: Solve for x
    x = 352,946.67/664.68
  6. Step 6: Final answer
    x = 531.00

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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.