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Finding the Fourth Proportional to 411.75, 615.35 and 330.21

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Solution

The fourth proportional to 411.75, 615.35 and 330.21 is: 493.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.75 : 615.35 = 330.21 : x
  2. Step 2: Convert to fraction form
    411.75/615.35 = 330.21/x
  3. Step 3: Cross multiply
    411.75x = 615.35 × 330.21
  4. Step 4: Simplify right side
    411.75x = 203,195.55
  5. Step 5: Solve for x
    x = 203,195.55/411.75
  6. Step 6: Final answer
    x = 493.49

Related Problems

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.