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Finding the Fourth Proportional to 959.11, 1,438.71 and 439.14

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Solution

The fourth proportional to 959.11, 1,438.71 and 439.14 is: 658.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.11 : 1,438.71 = 439.14 : x
  2. Step 2: Convert to fraction form
    959.11/1,438.71 = 439.14/x
  3. Step 3: Cross multiply
    959.11x = 1,438.71 × 439.14
  4. Step 4: Simplify right side
    959.11x = 631,795.11
  5. Step 5: Solve for x
    x = 631,795.11/959.11
  6. Step 6: Final answer
    x = 658.73

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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.