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Finding the Fourth Proportional to 959.29, 1,438.11 and 439.11

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Solution

The fourth proportional to 959.29, 1,438.11 and 439.11 is: 658.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.29 : 1,438.11 = 439.11 : x
  2. Step 2: Convert to fraction form
    959.29/1,438.11 = 439.11/x
  3. Step 3: Cross multiply
    959.29x = 1,438.11 × 439.11
  4. Step 4: Simplify right side
    959.29x = 631,488.48
  5. Step 5: Solve for x
    x = 631,488.48/959.29
  6. Step 6: Final answer
    x = 658.29

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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.