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Finding the Fourth Proportional to 392.05, 540.52 and 275.77

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Solution

The fourth proportional to 392.05, 540.52 and 275.77 is: 380.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.05 : 540.52 = 275.77 : x
  2. Step 2: Convert to fraction form
    392.05/540.52 = 275.77/x
  3. Step 3: Cross multiply
    392.05x = 540.52 × 275.77
  4. Step 4: Simplify right side
    392.05x = 149,059.20
  5. Step 5: Solve for x
    x = 149,059.20/392.05
  6. Step 6: Final answer
    x = 380.20

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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.