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Finding the Fourth Proportional to 392.94, 585.12 and 388.08

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Solution

The fourth proportional to 392.94, 585.12 and 388.08 is: 577.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.94 : 585.12 = 388.08 : x
  2. Step 2: Convert to fraction form
    392.94/585.12 = 388.08/x
  3. Step 3: Cross multiply
    392.94x = 585.12 × 388.08
  4. Step 4: Simplify right side
    392.94x = 227,073.37
  5. Step 5: Solve for x
    x = 227,073.37/392.94
  6. Step 6: Final answer
    x = 577.88

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.