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Finding the Fourth Proportional to 1,215.79, 1,823.91 and 394.09

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Solution

The fourth proportional to 1,215.79, 1,823.91 and 394.09 is: 591.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.79 : 1,823.91 = 394.09 : x
  2. Step 2: Convert to fraction form
    1,215.79/1,823.91 = 394.09/x
  3. Step 3: Cross multiply
    1,215.79x = 1,823.91 × 394.09
  4. Step 4: Simplify right side
    1,215.79x = 718,784.69
  5. Step 5: Solve for x
    x = 718,784.69/1,215.79
  6. Step 6: Final answer
    x = 591.21

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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.