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Finding the Fourth Proportional to 899.87, 1,242.38 and 620.01

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Solution

The fourth proportional to 899.87, 1,242.38 and 620.01 is: 856.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    899.87 : 1,242.38 = 620.01 : x
  2. Step 2: Convert to fraction form
    899.87/1,242.38 = 620.01/x
  3. Step 3: Cross multiply
    899.87x = 1,242.38 × 620.01
  4. Step 4: Simplify right side
    899.87x = 770,289.57
  5. Step 5: Solve for x
    x = 770,289.57/899.87
  6. Step 6: Final answer
    x = 856.01

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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.