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Finding the Fourth Proportional to 827.74, 1,241.61 and 485.50

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Solution

The fourth proportional to 827.74, 1,241.61 and 485.50 is: 728.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    827.74 : 1,241.61 = 485.50 : x
  2. Step 2: Convert to fraction form
    827.74/1,241.61 = 485.50/x
  3. Step 3: Cross multiply
    827.74x = 1,241.61 × 485.50
  4. Step 4: Simplify right side
    827.74x = 602,801.66
  5. Step 5: Solve for x
    x = 602,801.66/827.74
  6. Step 6: Final answer
    x = 728.25

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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.