Home / 1,215.75-1,823.16-393.78

Finding the Fourth Proportional to 1,215.75, 1,823.16 and 393.78

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Solution

The fourth proportional to 1,215.75, 1,823.16 and 393.78 is: 590.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.75 : 1,823.16 = 393.78 : x
  2. Step 2: Convert to fraction form
    1,215.75/1,823.16 = 393.78/x
  3. Step 3: Cross multiply
    1,215.75x = 1,823.16 × 393.78
  4. Step 4: Simplify right side
    1,215.75x = 717,923.94
  5. Step 5: Solve for x
    x = 717,923.94/1,215.75
  6. Step 6: Final answer
    x = 590.52

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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.