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Finding the Fourth Proportional to 371.58, 511.68 and 318.73

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Solution

The fourth proportional to 371.58, 511.68 and 318.73 is: 438.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    371.58 : 511.68 = 318.73 : x
  2. Step 2: Convert to fraction form
    371.58/511.68 = 318.73/x
  3. Step 3: Cross multiply
    371.58x = 511.68 × 318.73
  4. Step 4: Simplify right side
    371.58x = 163,087.77
  5. Step 5: Solve for x
    x = 163,087.77/371.58
  6. Step 6: Final answer
    x = 438.90

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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.