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Finding the Fourth Proportional to 393.35, 586.44 and 388.49

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Solution

The fourth proportional to 393.35, 586.44 and 388.49 is: 579.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.35 : 586.44 = 388.49 : x
  2. Step 2: Convert to fraction form
    393.35/586.44 = 388.49/x
  3. Step 3: Cross multiply
    393.35x = 586.44 × 388.49
  4. Step 4: Simplify right side
    393.35x = 227,827.54
  5. Step 5: Solve for x
    x = 227,827.54/393.35
  6. Step 6: Final answer
    x = 579.19

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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.