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Finding the Fourth Proportional to 401.88, 606.41 and 386.88

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Solution

The fourth proportional to 401.88, 606.41 and 386.88 is: 583.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.88 : 606.41 = 386.88 : x
  2. Step 2: Convert to fraction form
    401.88/606.41 = 386.88/x
  3. Step 3: Cross multiply
    401.88x = 606.41 × 386.88
  4. Step 4: Simplify right side
    401.88x = 234,607.90
  5. Step 5: Solve for x
    x = 234,607.90/401.88
  6. Step 6: Final answer
    x = 583.78

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.