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Finding the Fourth Proportional to 405.09, 606.45 and 250.55

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Solution

The fourth proportional to 405.09, 606.45 and 250.55 is: 375.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.09 : 606.45 = 250.55 : x
  2. Step 2: Convert to fraction form
    405.09/606.45 = 250.55/x
  3. Step 3: Cross multiply
    405.09x = 606.45 × 250.55
  4. Step 4: Simplify right side
    405.09x = 151,946.05
  5. Step 5: Solve for x
    x = 151,946.05/405.09
  6. Step 6: Final answer
    x = 375.09

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Why These Related Problems?

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