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Finding the Fourth Proportional to 485.29, 669.65 and 286.19

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Solution

The fourth proportional to 485.29, 669.65 and 286.19 is: 394.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.29 : 669.65 = 286.19 : x
  2. Step 2: Convert to fraction form
    485.29/669.65 = 286.19/x
  3. Step 3: Cross multiply
    485.29x = 669.65 × 286.19
  4. Step 4: Simplify right side
    485.29x = 191,644.87
  5. Step 5: Solve for x
    x = 191,644.87/485.29
  6. Step 6: Final answer
    x = 394.91

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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.