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Finding the Fourth Proportional to 392, 541.08 and 288.80

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Solution

The fourth proportional to 392, 541.08 and 288.80 is: 398.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    392 : 541.08 = 288.80 : x
  2. Step 2: Convert to fraction form
    392/541.08 = 288.80/x
  3. Step 3: Cross multiply
    392x = 541.08 × 288.80
  4. Step 4: Simplify right side
    392x = 156,263.90
  5. Step 5: Solve for x
    x = 156,263.90/392
  6. Step 6: Final answer
    x = 398.63

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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.