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Finding the Fourth Proportional to 370.98, 556.74 and 208.78

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Solution

The fourth proportional to 370.98, 556.74 and 208.78 is: 313.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    370.98 : 556.74 = 208.78 : x
  2. Step 2: Convert to fraction form
    370.98/556.74 = 208.78/x
  3. Step 3: Cross multiply
    370.98x = 556.74 × 208.78
  4. Step 4: Simplify right side
    370.98x = 116,234.79
  5. Step 5: Solve for x
    x = 116,234.79/370.98
  6. Step 6: Final answer
    x = 313.32

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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.