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Finding the Fourth Proportional to 370.20, 554.96 and 139.08

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Solution

The fourth proportional to 370.20, 554.96 and 139.08 is: 208.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    370.20 : 554.96 = 139.08 : x
  2. Step 2: Convert to fraction form
    370.20/554.96 = 139.08/x
  3. Step 3: Cross multiply
    370.20x = 554.96 × 139.08
  4. Step 4: Simplify right side
    370.20x = 77,183.84
  5. Step 5: Solve for x
    x = 77,183.84/370.20
  6. Step 6: Final answer
    x = 208.49

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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.