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Finding the Fourth Proportional to 405.14, 606.36 and 279.74

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Solution

The fourth proportional to 405.14, 606.36 and 279.74 is: 418.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.14 : 606.36 = 279.74 : x
  2. Step 2: Convert to fraction form
    405.14/606.36 = 279.74/x
  3. Step 3: Cross multiply
    405.14x = 606.36 × 279.74
  4. Step 4: Simplify right side
    405.14x = 169,623.15
  5. Step 5: Solve for x
    x = 169,623.15/405.14
  6. Step 6: Final answer
    x = 418.68

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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.