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Finding the Fourth Proportional to 1,428.04, 2,142.23 and 550.34

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Solution

The fourth proportional to 1,428.04, 2,142.23 and 550.34 is: 825.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,428.04 : 2,142.23 = 550.34 : x
  2. Step 2: Convert to fraction form
    1,428.04/2,142.23 = 550.34/x
  3. Step 3: Cross multiply
    1,428.04x = 2,142.23 × 550.34
  4. Step 4: Simplify right side
    1,428.04x = 1,178,954.86
  5. Step 5: Solve for x
    x = 1,178,954.86/1,428.04
  6. Step 6: Final answer
    x = 825.58

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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.