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Finding the Fourth Proportional to 392.11, 541.08 and 309.40

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Solution

The fourth proportional to 392.11, 541.08 and 309.40 is: 426.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.11 : 541.08 = 309.40 : x
  2. Step 2: Convert to fraction form
    392.11/541.08 = 309.40/x
  3. Step 3: Cross multiply
    392.11x = 541.08 × 309.40
  4. Step 4: Simplify right side
    392.11x = 167,410.15
  5. Step 5: Solve for x
    x = 167,410.15/392.11
  6. Step 6: Final answer
    x = 426.95

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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.