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Finding the Fourth Proportional to 1,415.91, 2,124.78 and 550.22

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Solution

The fourth proportional to 1,415.91, 2,124.78 and 550.22 is: 825.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,415.91 : 2,124.78 = 550.22 : x
  2. Step 2: Convert to fraction form
    1,415.91/2,124.78 = 550.22/x
  3. Step 3: Cross multiply
    1,415.91x = 2,124.78 × 550.22
  4. Step 4: Simplify right side
    1,415.91x = 1,169,091.73
  5. Step 5: Solve for x
    x = 1,169,091.73/1,415.91
  6. Step 6: Final answer
    x = 825.68

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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.