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Finding the Fourth Proportional to 405.11, 607.15 and 220

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Solution

The fourth proportional to 405.11, 607.15 and 220 is: 329.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.11 : 607.15 = 220 : x
  2. Step 2: Convert to fraction form
    405.11/607.15 = 220/x
  3. Step 3: Cross multiply
    405.11x = 607.15 × 220
  4. Step 4: Simplify right side
    405.11x = 133,571.90
  5. Step 5: Solve for x
    x = 133,571.90/405.11
  6. Step 6: Final answer
    x = 329.72

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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.