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Finding the Fourth Proportional to 405.90, 608.64 and 223.20

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Solution

The fourth proportional to 405.90, 608.64 and 223.20 is: 334.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.90 : 608.64 = 223.20 : x
  2. Step 2: Convert to fraction form
    405.90/608.64 = 223.20/x
  3. Step 3: Cross multiply
    405.90x = 608.64 × 223.20
  4. Step 4: Simplify right side
    405.90x = 135,848.45
  5. Step 5: Solve for x
    x = 135,848.45/405.90
  6. Step 6: Final answer
    x = 334.68

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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.