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Finding the Fourth Proportional to 392.20, 540.95 and 386.12

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Solution

The fourth proportional to 392.20, 540.95 and 386.12 is: 532.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.20 : 540.95 = 386.12 : x
  2. Step 2: Convert to fraction form
    392.20/540.95 = 386.12/x
  3. Step 3: Cross multiply
    392.20x = 540.95 × 386.12
  4. Step 4: Simplify right side
    392.20x = 208,871.04
  5. Step 5: Solve for x
    x = 208,871.04/392.20
  6. Step 6: Final answer
    x = 532.57

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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.