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Finding the Fourth Proportional to 371.20, 511.39 and 318.57

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Solution

The fourth proportional to 371.20, 511.39 and 318.57 is: 438.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    371.20 : 511.39 = 318.57 : x
  2. Step 2: Convert to fraction form
    371.20/511.39 = 318.57/x
  3. Step 3: Cross multiply
    371.20x = 511.39 × 318.57
  4. Step 4: Simplify right side
    371.20x = 162,913.51
  5. Step 5: Solve for x
    x = 162,913.51/371.20
  6. Step 6: Final answer
    x = 438.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.