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Finding the Fourth Proportional to 900.08, 1,242.21 and 550.56

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Solution

The fourth proportional to 900.08, 1,242.21 and 550.56 is: 759.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.08 : 1,242.21 = 550.56 : x
  2. Step 2: Convert to fraction form
    900.08/1,242.21 = 550.56/x
  3. Step 3: Cross multiply
    900.08x = 1,242.21 × 550.56
  4. Step 4: Simplify right side
    900.08x = 683,911.14
  5. Step 5: Solve for x
    x = 683,911.14/900.08
  6. Step 6: Final answer
    x = 759.83

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.