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Finding the Fourth Proportional to 378.08, 521.84 and 240

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Solution

The fourth proportional to 378.08, 521.84 and 240 is: 331.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.08 : 521.84 = 240 : x
  2. Step 2: Convert to fraction form
    378.08/521.84 = 240/x
  3. Step 3: Cross multiply
    378.08x = 521.84 × 240
  4. Step 4: Simplify right side
    378.08x = 125,241.60
  5. Step 5: Solve for x
    x = 125,241.60/378.08
  6. Step 6: Final answer
    x = 331.26

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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.