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Finding the Fourth Proportional to 1,188.38, 1,639.80 and 664.37

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Solution

The fourth proportional to 1,188.38, 1,639.80 and 664.37 is: 916.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,188.38 : 1,639.80 = 664.37 : x
  2. Step 2: Convert to fraction form
    1,188.38/1,639.80 = 664.37/x
  3. Step 3: Cross multiply
    1,188.38x = 1,639.80 × 664.37
  4. Step 4: Simplify right side
    1,188.38x = 1,089,425.73
  5. Step 5: Solve for x
    x = 1,089,425.73/1,188.38
  6. Step 6: Final answer
    x = 916.74

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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.