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Finding the Fourth Proportional to 403.32, 605.60 and 386

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Solution

The fourth proportional to 403.32, 605.60 and 386 is: 579.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.32 : 605.60 = 386 : x
  2. Step 2: Convert to fraction form
    403.32/605.60 = 386/x
  3. Step 3: Cross multiply
    403.32x = 605.60 × 386
  4. Step 4: Simplify right side
    403.32x = 233,761.60
  5. Step 5: Solve for x
    x = 233,761.60/403.32
  6. Step 6: Final answer
    x = 579.59

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.