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Finding the Fourth Proportional to 371.08, 512.76 and 288.40

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Solution

The fourth proportional to 371.08, 512.76 and 288.40 is: 398.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    371.08 : 512.76 = 288.40 : x
  2. Step 2: Convert to fraction form
    371.08/512.76 = 288.40/x
  3. Step 3: Cross multiply
    371.08x = 512.76 × 288.40
  4. Step 4: Simplify right side
    371.08x = 147,879.98
  5. Step 5: Solve for x
    x = 147,879.98/371.08
  6. Step 6: Final answer
    x = 398.51

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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.