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Finding the Fourth Proportional to 660.43, 911.43 and 380.74

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Solution

The fourth proportional to 660.43, 911.43 and 380.74 is: 525.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.43 : 911.43 = 380.74 : x
  2. Step 2: Convert to fraction form
    660.43/911.43 = 380.74/x
  3. Step 3: Cross multiply
    660.43x = 911.43 × 380.74
  4. Step 4: Simplify right side
    660.43x = 347,017.86
  5. Step 5: Solve for x
    x = 347,017.86/660.43
  6. Step 6: Final answer
    x = 525.44

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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.