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Finding the Fourth Proportional to 1,215.80, 1,823.22 and 445.88

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Solution

The fourth proportional to 1,215.80, 1,823.22 and 445.88 is: 668.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.80 : 1,823.22 = 445.88 : x
  2. Step 2: Convert to fraction form
    1,215.80/1,823.22 = 445.88/x
  3. Step 3: Cross multiply
    1,215.80x = 1,823.22 × 445.88
  4. Step 4: Simplify right side
    1,215.80x = 812,937.33
  5. Step 5: Solve for x
    x = 812,937.33/1,215.80
  6. Step 6: Final answer
    x = 668.64

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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.