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Finding the Fourth Proportional to 378.06, 521.91 and 245.34

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Solution

The fourth proportional to 378.06, 521.91 and 245.34 is: 338.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.06 : 521.91 = 245.34 : x
  2. Step 2: Convert to fraction form
    378.06/521.91 = 245.34/x
  3. Step 3: Cross multiply
    378.06x = 521.91 × 245.34
  4. Step 4: Simplify right side
    378.06x = 128,045.40
  5. Step 5: Solve for x
    x = 128,045.40/378.06
  6. Step 6: Final answer
    x = 338.69

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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.