Home / 1,213.14-1,819.95-391.62

Finding the Fourth Proportional to 1,213.14, 1,819.95 and 391.62

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Solution

The fourth proportional to 1,213.14, 1,819.95 and 391.62 is: 587.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,213.14 : 1,819.95 = 391.62 : x
  2. Step 2: Convert to fraction form
    1,213.14/1,819.95 = 391.62/x
  3. Step 3: Cross multiply
    1,213.14x = 1,819.95 × 391.62
  4. Step 4: Simplify right side
    1,213.14x = 712,728.82
  5. Step 5: Solve for x
    x = 712,728.82/1,213.14
  6. Step 6: Final answer
    x = 587.51

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1.5x scale

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.