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Finding the Fourth Proportional to 1,188.31, 1,639.87 and 664.34

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Solution

The fourth proportional to 1,188.31, 1,639.87 and 664.34 is: 916.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,188.31 : 1,639.87 = 664.34 : x
  2. Step 2: Convert to fraction form
    1,188.31/1,639.87 = 664.34/x
  3. Step 3: Cross multiply
    1,188.31x = 1,639.87 × 664.34
  4. Step 4: Simplify right side
    1,188.31x = 1,089,431.24
  5. Step 5: Solve for x
    x = 1,089,431.24/1,188.31
  6. Step 6: Final answer
    x = 916.79

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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.