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Finding the Fourth Proportional to 407.98, 611.78 and 202.47

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Solution

The fourth proportional to 407.98, 611.78 and 202.47 is: 303.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.98 : 611.78 = 202.47 : x
  2. Step 2: Convert to fraction form
    407.98/611.78 = 202.47/x
  3. Step 3: Cross multiply
    407.98x = 611.78 × 202.47
  4. Step 4: Simplify right side
    407.98x = 123,867.10
  5. Step 5: Solve for x
    x = 123,867.10/407.98
  6. Step 6: Final answer
    x = 303.61

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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.