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Finding the Fourth Proportional to 406.56, 605.75 and 385.62

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Solution

The fourth proportional to 406.56, 605.75 and 385.62 is: 574.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    406.56 : 605.75 = 385.62 : x
  2. Step 2: Convert to fraction form
    406.56/605.75 = 385.62/x
  3. Step 3: Cross multiply
    406.56x = 605.75 × 385.62
  4. Step 4: Simplify right side
    406.56x = 233,587.39
  5. Step 5: Solve for x
    x = 233,587.39/406.56
  6. Step 6: Final answer
    x = 574.55

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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.