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Finding the Fourth Proportional to 900.10, 1,241.88 and 620.41

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Solution

The fourth proportional to 900.10, 1,241.88 and 620.41 is: 855.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.10 : 1,241.88 = 620.41 : x
  2. Step 2: Convert to fraction form
    900.10/1,241.88 = 620.41/x
  3. Step 3: Cross multiply
    900.10x = 1,241.88 × 620.41
  4. Step 4: Simplify right side
    900.10x = 770,474.77
  5. Step 5: Solve for x
    x = 770,474.77/900.10
  6. Step 6: Final answer
    x = 855.99

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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.