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Finding the Fourth Proportional to 485.39, 669.90 and 286.27

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Solution

The fourth proportional to 485.39, 669.90 and 286.27 is: 395.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.39 : 669.90 = 286.27 : x
  2. Step 2: Convert to fraction form
    485.39/669.90 = 286.27/x
  3. Step 3: Cross multiply
    485.39x = 669.90 × 286.27
  4. Step 4: Simplify right side
    485.39x = 191,771.67
  5. Step 5: Solve for x
    x = 191,771.67/485.39
  6. Step 6: Final answer
    x = 395.09

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1.5x scale

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.