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Finding the Fourth Proportional to 1,188.38, 1,639.99 and 664.41

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Solution

The fourth proportional to 1,188.38, 1,639.99 and 664.41 is: 916.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,188.38 : 1,639.99 = 664.41 : x
  2. Step 2: Convert to fraction form
    1,188.38/1,639.99 = 664.41/x
  3. Step 3: Cross multiply
    1,188.38x = 1,639.99 × 664.41
  4. Step 4: Simplify right side
    1,188.38x = 1,089,623.32
  5. Step 5: Solve for x
    x = 1,089,623.32/1,188.38
  6. Step 6: Final answer
    x = 916.90

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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.