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Finding the Fourth Proportional to 407.98, 611.97 and 119.40

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Solution

The fourth proportional to 407.98, 611.97 and 119.40 is: 179.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.98 : 611.97 = 119.40 : x
  2. Step 2: Convert to fraction form
    407.98/611.97 = 119.40/x
  3. Step 3: Cross multiply
    407.98x = 611.97 × 119.40
  4. Step 4: Simplify right side
    407.98x = 73,069.22
  5. Step 5: Solve for x
    x = 73,069.22/407.98
  6. Step 6: Final answer
    x = 179.10

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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.