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Finding the Fourth Proportional to 485.07, 727.80 and 290.44

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Solution

The fourth proportional to 485.07, 727.80 and 290.44 is: 435.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.07 : 727.80 = 290.44 : x
  2. Step 2: Convert to fraction form
    485.07/727.80 = 290.44/x
  3. Step 3: Cross multiply
    485.07x = 727.80 × 290.44
  4. Step 4: Simplify right side
    485.07x = 211,382.23
  5. Step 5: Solve for x
    x = 211,382.23/485.07
  6. Step 6: Final answer
    x = 435.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.