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Finding the Fourth Proportional to 298.94, 412.40 and 205.80

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Solution

The fourth proportional to 298.94, 412.40 and 205.80 is: 283.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    298.94 : 412.40 = 205.80 : x
  2. Step 2: Convert to fraction form
    298.94/412.40 = 205.80/x
  3. Step 3: Cross multiply
    298.94x = 412.40 × 205.80
  4. Step 4: Simplify right side
    298.94x = 84,870.89
  5. Step 5: Solve for x
    x = 84,870.89/298.94
  6. Step 6: Final answer
    x = 283.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.