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Finding the Fourth Proportional to 371.09, 556.64 and 139.96

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Solution

The fourth proportional to 371.09, 556.64 and 139.96 is: 209.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    371.09 : 556.64 = 139.96 : x
  2. Step 2: Convert to fraction form
    371.09/556.64 = 139.96/x
  3. Step 3: Cross multiply
    371.09x = 556.64 × 139.96
  4. Step 4: Simplify right side
    371.09x = 77,907.86
  5. Step 5: Solve for x
    x = 77,907.86/371.09
  6. Step 6: Final answer
    x = 209.94

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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.