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Finding the Fourth Proportional to 485.06, 669.26 and 310.46

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Solution

The fourth proportional to 485.06, 669.26 and 310.46 is: 428.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.06 : 669.26 = 310.46 : x
  2. Step 2: Convert to fraction form
    485.06/669.26 = 310.46/x
  3. Step 3: Cross multiply
    485.06x = 669.26 × 310.46
  4. Step 4: Simplify right side
    485.06x = 207,778.46
  5. Step 5: Solve for x
    x = 207,778.46/485.06
  6. Step 6: Final answer
    x = 428.36

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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.