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Finding the Fourth Proportional to 485.40, 670.22 and 448.54

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Solution

The fourth proportional to 485.40, 670.22 and 448.54 is: 619.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.40 : 670.22 = 448.54 : x
  2. Step 2: Convert to fraction form
    485.40/670.22 = 448.54/x
  3. Step 3: Cross multiply
    485.40x = 670.22 × 448.54
  4. Step 4: Simplify right side
    485.40x = 300,620.48
  5. Step 5: Solve for x
    x = 300,620.48/485.40
  6. Step 6: Final answer
    x = 619.33

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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.