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Finding the Fourth Proportional to 438.22, 605.02 and 305.40

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Solution

The fourth proportional to 438.22, 605.02 and 305.40 is: 421.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.22 : 605.02 = 305.40 : x
  2. Step 2: Convert to fraction form
    438.22/605.02 = 305.40/x
  3. Step 3: Cross multiply
    438.22x = 605.02 × 305.40
  4. Step 4: Simplify right side
    438.22x = 184,773.11
  5. Step 5: Solve for x
    x = 184,773.11/438.22
  6. Step 6: Final answer
    x = 421.64

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.