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Finding the Fourth Proportional to 371.55, 512.69 and 289.28

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Solution

The fourth proportional to 371.55, 512.69 and 289.28 is: 399.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    371.55 : 512.69 = 289.28 : x
  2. Step 2: Convert to fraction form
    371.55/512.69 = 289.28/x
  3. Step 3: Cross multiply
    371.55x = 512.69 × 289.28
  4. Step 4: Simplify right side
    371.55x = 148,310.80
  5. Step 5: Solve for x
    x = 148,310.80/371.55
  6. Step 6: Final answer
    x = 399.16

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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.