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Finding the Fourth Proportional to 945.94, 1,419.35 and 426.09

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Solution

The fourth proportional to 945.94, 1,419.35 and 426.09 is: 639.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    945.94 : 1,419.35 = 426.09 : x
  2. Step 2: Convert to fraction form
    945.94/1,419.35 = 426.09/x
  3. Step 3: Cross multiply
    945.94x = 1,419.35 × 426.09
  4. Step 4: Simplify right side
    945.94x = 604,770.84
  5. Step 5: Solve for x
    x = 604,770.84/945.94
  6. Step 6: Final answer
    x = 639.33

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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.