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Finding the Fourth Proportional to 959.15, 1,438.41 and 309.73

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Solution

The fourth proportional to 959.15, 1,438.41 and 309.73 is: 464.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.15 : 1,438.41 = 309.73 : x
  2. Step 2: Convert to fraction form
    959.15/1,438.41 = 309.73/x
  3. Step 3: Cross multiply
    959.15x = 1,438.41 × 309.73
  4. Step 4: Simplify right side
    959.15x = 445,519.50
  5. Step 5: Solve for x
    x = 445,519.50/959.15
  6. Step 6: Final answer
    x = 464.50

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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.