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Finding the Fourth Proportional to 407.30, 611.21 and 201.88

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Solution

The fourth proportional to 407.30, 611.21 and 201.88 is: 302.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.30 : 611.21 = 201.88 : x
  2. Step 2: Convert to fraction form
    407.30/611.21 = 201.88/x
  3. Step 3: Cross multiply
    407.30x = 611.21 × 201.88
  4. Step 4: Simplify right side
    407.30x = 123,390.07
  5. Step 5: Solve for x
    x = 123,390.07/407.30
  6. Step 6: Final answer
    x = 302.95

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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.