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Finding the Fourth Proportional to 371.84, 512.96 and 288.80

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Solution

The fourth proportional to 371.84, 512.96 and 288.80 is: 398.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    371.84 : 512.96 = 288.80 : x
  2. Step 2: Convert to fraction form
    371.84/512.96 = 288.80/x
  3. Step 3: Cross multiply
    371.84x = 512.96 × 288.80
  4. Step 4: Simplify right side
    371.84x = 148,142.85
  5. Step 5: Solve for x
    x = 148,142.85/371.84
  6. Step 6: Final answer
    x = 398.40

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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.