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Finding the Fourth Proportional to 371.94, 513.34 and 312.87

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Solution

The fourth proportional to 371.94, 513.34 and 312.87 is: 431.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    371.94 : 513.34 = 312.87 : x
  2. Step 2: Convert to fraction form
    371.94/513.34 = 312.87/x
  3. Step 3: Cross multiply
    371.94x = 513.34 × 312.87
  4. Step 4: Simplify right side
    371.94x = 160,609.83
  5. Step 5: Solve for x
    x = 160,609.83/371.94
  6. Step 6: Final answer
    x = 431.82

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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.