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Finding the Fourth Proportional to 622.40, 933.90 and 439.40

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Solution

The fourth proportional to 622.40, 933.90 and 439.40 is: 659.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    622.40 : 933.90 = 439.40 : x
  2. Step 2: Convert to fraction form
    622.40/933.90 = 439.40/x
  3. Step 3: Cross multiply
    622.40x = 933.90 × 439.40
  4. Step 4: Simplify right side
    622.40x = 410,355.66
  5. Step 5: Solve for x
    x = 410,355.66/622.40
  6. Step 6: Final answer
    x = 659.31

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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.