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Finding the Fourth Proportional to 959.19, 1,438.65 and 411.09

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Solution

The fourth proportional to 959.19, 1,438.65 and 411.09 is: 616.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.19 : 1,438.65 = 411.09 : x
  2. Step 2: Convert to fraction form
    959.19/1,438.65 = 411.09/x
  3. Step 3: Cross multiply
    959.19x = 1,438.65 × 411.09
  4. Step 4: Simplify right side
    959.19x = 591,414.63
  5. Step 5: Solve for x
    x = 591,414.63/959.19
  6. Step 6: Final answer
    x = 616.58

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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.