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Finding the Fourth Proportional to 1,188.50, 1,640.14 and 664.68

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Solution

The fourth proportional to 1,188.50, 1,640.14 and 664.68 is: 917.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,188.50 : 1,640.14 = 664.68 : x
  2. Step 2: Convert to fraction form
    1,188.50/1,640.14 = 664.68/x
  3. Step 3: Cross multiply
    1,188.50x = 1,640.14 × 664.68
  4. Step 4: Simplify right side
    1,188.50x = 1,090,168.26
  5. Step 5: Solve for x
    x = 1,090,168.26/1,188.50
  6. Step 6: Final answer
    x = 917.26

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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.