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Finding the Fourth Proportional to 370.80, 556.20 and 298.80

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Solution

The fourth proportional to 370.80, 556.20 and 298.80 is: 448.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    370.80 : 556.20 = 298.80 : x
  2. Step 2: Convert to fraction form
    370.80/556.20 = 298.80/x
  3. Step 3: Cross multiply
    370.80x = 556.20 × 298.80
  4. Step 4: Simplify right side
    370.80x = 166,192.56
  5. Step 5: Solve for x
    x = 166,192.56/370.80
  6. Step 6: Final answer
    x = 448.20

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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.