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Finding the Fourth Proportional to 959.65, 1,438.46 and 411.38

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Solution

The fourth proportional to 959.65, 1,438.46 and 411.38 is: 616.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.65 : 1,438.46 = 411.38 : x
  2. Step 2: Convert to fraction form
    959.65/1,438.46 = 411.38/x
  3. Step 3: Cross multiply
    959.65x = 1,438.46 × 411.38
  4. Step 4: Simplify right side
    959.65x = 591,751.36
  5. Step 5: Solve for x
    x = 591,751.36/959.65
  6. Step 6: Final answer
    x = 616.63

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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.