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Finding the Fourth Proportional to 1,188.84, 1,640.55 and 664.86

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Solution

The fourth proportional to 1,188.84, 1,640.55 and 664.86 is: 917.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,188.84 : 1,640.55 = 664.86 : x
  2. Step 2: Convert to fraction form
    1,188.84/1,640.55 = 664.86/x
  3. Step 3: Cross multiply
    1,188.84x = 1,640.55 × 664.86
  4. Step 4: Simplify right side
    1,188.84x = 1,090,736.07
  5. Step 5: Solve for x
    x = 1,090,736.07/1,188.84
  6. Step 6: Final answer
    x = 917.48

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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.