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Finding the Fourth Proportional to 405.20, 607.70 and 222.50

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Solution

The fourth proportional to 405.20, 607.70 and 222.50 is: 333.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.20 : 607.70 = 222.50 : x
  2. Step 2: Convert to fraction form
    405.20/607.70 = 222.50/x
  3. Step 3: Cross multiply
    405.20x = 607.70 × 222.50
  4. Step 4: Simplify right side
    405.20x = 135,213.25
  5. Step 5: Solve for x
    x = 135,213.25/405.20
  6. Step 6: Final answer
    x = 333.70

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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.