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Finding the Fourth Proportional to 485.56, 669.09 and 374.86

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Solution

The fourth proportional to 485.56, 669.09 and 374.86 is: 516.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.56 : 669.09 = 374.86 : x
  2. Step 2: Convert to fraction form
    485.56/669.09 = 374.86/x
  3. Step 3: Cross multiply
    485.56x = 669.09 × 374.86
  4. Step 4: Simplify right side
    485.56x = 250,815.08
  5. Step 5: Solve for x
    x = 250,815.08/485.56
  6. Step 6: Final answer
    x = 516.55

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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.