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Finding the Fourth Proportional to 371.10, 511.58 and 305.09

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Solution

The fourth proportional to 371.10, 511.58 and 305.09 is: 420.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    371.10 : 511.58 = 305.09 : x
  2. Step 2: Convert to fraction form
    371.10/511.58 = 305.09/x
  3. Step 3: Cross multiply
    371.10x = 511.58 × 305.09
  4. Step 4: Simplify right side
    371.10x = 156,078.07
  5. Step 5: Solve for x
    x = 156,078.07/371.10
  6. Step 6: Final answer
    x = 420.58

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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.