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Finding the Fourth Proportional to 392.31, 541.40 and 245.07

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Solution

The fourth proportional to 392.31, 541.40 and 245.07 is: 338.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.31 : 541.40 = 245.07 : x
  2. Step 2: Convert to fraction form
    392.31/541.40 = 245.07/x
  3. Step 3: Cross multiply
    392.31x = 541.40 × 245.07
  4. Step 4: Simplify right side
    392.31x = 132,679.67
  5. Step 5: Solve for x
    x = 132,679.67/392.31
  6. Step 6: Final answer
    x = 338.20

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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.