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Finding the Fourth Proportional to 371.06, 511.74 and 287.90

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Solution

The fourth proportional to 371.06, 511.74 and 287.90 is: 397.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    371.06 : 511.74 = 287.90 : x
  2. Step 2: Convert to fraction form
    371.06/511.74 = 287.90/x
  3. Step 3: Cross multiply
    371.06x = 511.74 × 287.90
  4. Step 4: Simplify right side
    371.06x = 147,329.95
  5. Step 5: Solve for x
    x = 147,329.95/371.06
  6. Step 6: Final answer
    x = 397.05

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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.