Home / 1,213.25-1,819.95-391.46

Finding the Fourth Proportional to 1,213.25, 1,819.95 and 391.46

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Solution

The fourth proportional to 1,213.25, 1,819.95 and 391.46 is: 587.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,213.25 : 1,819.95 = 391.46 : x
  2. Step 2: Convert to fraction form
    1,213.25/1,819.95 = 391.46/x
  3. Step 3: Cross multiply
    1,213.25x = 1,819.95 × 391.46
  4. Step 4: Simplify right side
    1,213.25x = 712,435.67
  5. Step 5: Solve for x
    x = 712,435.67/1,213.25
  6. Step 6: Final answer
    x = 587.21

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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.