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Finding the Fourth Proportional to 959.75, 1,438.49 and 439.28

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Solution

The fourth proportional to 959.75, 1,438.49 and 439.28 is: 658.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.75 : 1,438.49 = 439.28 : x
  2. Step 2: Convert to fraction form
    959.75/1,438.49 = 439.28/x
  3. Step 3: Cross multiply
    959.75x = 1,438.49 × 439.28
  4. Step 4: Simplify right side
    959.75x = 631,890.50
  5. Step 5: Solve for x
    x = 631,890.50/959.75
  6. Step 6: Final answer
    x = 658.39

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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.