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Finding the Fourth Proportional to 405.50, 608.40 and 243.30

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Solution

The fourth proportional to 405.50, 608.40 and 243.30 is: 365.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.50 : 608.40 = 243.30 : x
  2. Step 2: Convert to fraction form
    405.50/608.40 = 243.30/x
  3. Step 3: Cross multiply
    405.50x = 608.40 × 243.30
  4. Step 4: Simplify right side
    405.50x = 148,023.72
  5. Step 5: Solve for x
    x = 148,023.72/405.50
  6. Step 6: Final answer
    x = 365.04

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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.