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Finding the Fourth Proportional to 370.26, 555.48 and 139.21

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Solution

The fourth proportional to 370.26, 555.48 and 139.21 is: 208.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    370.26 : 555.48 = 139.21 : x
  2. Step 2: Convert to fraction form
    370.26/555.48 = 139.21/x
  3. Step 3: Cross multiply
    370.26x = 555.48 × 139.21
  4. Step 4: Simplify right side
    370.26x = 77,326.98
  5. Step 5: Solve for x
    x = 77,326.98/370.26
  6. Step 6: Final answer
    x = 208.85

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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.