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Finding the Fourth Proportional to 393.07, 585.30 and 388.72

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Solution

The fourth proportional to 393.07, 585.30 and 388.72 is: 578.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.07 : 585.30 = 388.72 : x
  2. Step 2: Convert to fraction form
    393.07/585.30 = 388.72/x
  3. Step 3: Cross multiply
    393.07x = 585.30 × 388.72
  4. Step 4: Simplify right side
    393.07x = 227,517.82
  5. Step 5: Solve for x
    x = 227,517.82/393.07
  6. Step 6: Final answer
    x = 578.82

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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.