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Finding the Fourth Proportional to 1,188.63, 1,640.31 and 664.66

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Solution

The fourth proportional to 1,188.63, 1,640.31 and 664.66 is: 917.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,188.63 : 1,640.31 = 664.66 : x
  2. Step 2: Convert to fraction form
    1,188.63/1,640.31 = 664.66/x
  3. Step 3: Cross multiply
    1,188.63x = 1,640.31 × 664.66
  4. Step 4: Simplify right side
    1,188.63x = 1,090,248.44
  5. Step 5: Solve for x
    x = 1,090,248.44/1,188.63
  6. Step 6: Final answer
    x = 917.23

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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.