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Finding the Fourth Proportional to 660.77, 911.98 and 380.96

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Solution

The fourth proportional to 660.77, 911.98 and 380.96 is: 525.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.77 : 911.98 = 380.96 : x
  2. Step 2: Convert to fraction form
    660.77/911.98 = 380.96/x
  3. Step 3: Cross multiply
    660.77x = 911.98 × 380.96
  4. Step 4: Simplify right side
    660.77x = 347,425.09
  5. Step 5: Solve for x
    x = 347,425.09/660.77
  6. Step 6: Final answer
    x = 525.78

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1.5x scale

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.