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Finding the Fourth Proportional to 392.77, 541.40 and 287.86

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Solution

The fourth proportional to 392.77, 541.40 and 287.86 is: 396.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.77 : 541.40 = 287.86 : x
  2. Step 2: Convert to fraction form
    392.77/541.40 = 287.86/x
  3. Step 3: Cross multiply
    392.77x = 541.40 × 287.86
  4. Step 4: Simplify right side
    392.77x = 155,847.40
  5. Step 5: Solve for x
    x = 155,847.40/392.77
  6. Step 6: Final answer
    x = 396.79

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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.