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Finding the Fourth Proportional to 899.91, 1,242.41 and 620.06

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Solution

The fourth proportional to 899.91, 1,242.41 and 620.06 is: 856.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    899.91 : 1,242.41 = 620.06 : x
  2. Step 2: Convert to fraction form
    899.91/1,242.41 = 620.06/x
  3. Step 3: Cross multiply
    899.91x = 1,242.41 × 620.06
  4. Step 4: Simplify right side
    899.91x = 770,359.43
  5. Step 5: Solve for x
    x = 770,359.43/899.91
  6. Step 6: Final answer
    x = 856.04

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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.