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Finding the Fourth Proportional to 621.20, 931.86 and 274.49

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Solution

The fourth proportional to 621.20, 931.86 and 274.49 is: 411.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.20 : 931.86 = 274.49 : x
  2. Step 2: Convert to fraction form
    621.20/931.86 = 274.49/x
  3. Step 3: Cross multiply
    621.20x = 931.86 × 274.49
  4. Step 4: Simplify right side
    621.20x = 255,786.25
  5. Step 5: Solve for x
    x = 255,786.25/621.20
  6. Step 6: Final answer
    x = 411.76

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.