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Finding the Fourth Proportional to 485.22, 669.62 and 319.31

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Solution

The fourth proportional to 485.22, 669.62 and 319.31 is: 440.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.22 : 669.62 = 319.31 : x
  2. Step 2: Convert to fraction form
    485.22/669.62 = 319.31/x
  3. Step 3: Cross multiply
    485.22x = 669.62 × 319.31
  4. Step 4: Simplify right side
    485.22x = 213,813.81
  5. Step 5: Solve for x
    x = 213,813.81/485.22
  6. Step 6: Final answer
    x = 440.65

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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.