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Finding the Fourth Proportional to 1,215.91, 1,823.90 and 394.19

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Solution

The fourth proportional to 1,215.91, 1,823.90 and 394.19 is: 591.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.91 : 1,823.90 = 394.19 : x
  2. Step 2: Convert to fraction form
    1,215.91/1,823.90 = 394.19/x
  3. Step 3: Cross multiply
    1,215.91x = 1,823.90 × 394.19
  4. Step 4: Simplify right side
    1,215.91x = 718,952.05
  5. Step 5: Solve for x
    x = 718,952.05/1,215.91
  6. Step 6: Final answer
    x = 591.29

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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.