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Finding the Fourth Proportional to 371.28, 556.86 and 114.78

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Solution

The fourth proportional to 371.28, 556.86 and 114.78 is: 172.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    371.28 : 556.86 = 114.78 : x
  2. Step 2: Convert to fraction form
    371.28/556.86 = 114.78/x
  3. Step 3: Cross multiply
    371.28x = 556.86 × 114.78
  4. Step 4: Simplify right side
    371.28x = 63,916.39
  5. Step 5: Solve for x
    x = 63,916.39/371.28
  6. Step 6: Final answer
    x = 172.15

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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.