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Finding the Fourth Proportional to 959.31, 1,438.65 and 411.15

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Solution

The fourth proportional to 959.31, 1,438.65 and 411.15 is: 616.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.31 : 1,438.65 = 411.15 : x
  2. Step 2: Convert to fraction form
    959.31/1,438.65 = 411.15/x
  3. Step 3: Cross multiply
    959.31x = 1,438.65 × 411.15
  4. Step 4: Simplify right side
    959.31x = 591,500.95
  5. Step 5: Solve for x
    x = 591,500.95/959.31
  6. Step 6: Final answer
    x = 616.59

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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.