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Finding the Fourth Proportional to 660.43, 911.48 and 380.71

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Solution

The fourth proportional to 660.43, 911.48 and 380.71 is: 525.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.43 : 911.48 = 380.71 : x
  2. Step 2: Convert to fraction form
    660.43/911.48 = 380.71/x
  3. Step 3: Cross multiply
    660.43x = 911.48 × 380.71
  4. Step 4: Simplify right side
    660.43x = 347,009.55
  5. Step 5: Solve for x
    x = 347,009.55/660.43
  6. Step 6: Final answer
    x = 525.43

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.