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Finding the Fourth Proportional to 946.33, 1,419.90 and 639.34

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Solution

The fourth proportional to 946.33, 1,419.90 and 639.34 is: 959.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    946.33 : 1,419.90 = 639.34 : x
  2. Step 2: Convert to fraction form
    946.33/1,419.90 = 639.34/x
  3. Step 3: Cross multiply
    946.33x = 1,419.90 × 639.34
  4. Step 4: Simplify right side
    946.33x = 907,798.87
  5. Step 5: Solve for x
    x = 907,798.87/946.33
  6. Step 6: Final answer
    x = 959.28

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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.