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Finding the Fourth Proportional to 374.94, 518.40 and 331.20

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Solution

The fourth proportional to 374.94, 518.40 and 331.20 is: 457.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    374.94 : 518.40 = 331.20 : x
  2. Step 2: Convert to fraction form
    374.94/518.40 = 331.20/x
  3. Step 3: Cross multiply
    374.94x = 518.40 × 331.20
  4. Step 4: Simplify right side
    374.94x = 171,694.08
  5. Step 5: Solve for x
    x = 171,694.08/374.94
  6. Step 6: Final answer
    x = 457.92

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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.