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Finding the Fourth Proportional to 840.44, 1,261.74 and 455.96

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Solution

The fourth proportional to 840.44, 1,261.74 and 455.96 is: 684.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.44 : 1,261.74 = 455.96 : x
  2. Step 2: Convert to fraction form
    840.44/1,261.74 = 455.96/x
  3. Step 3: Cross multiply
    840.44x = 1,261.74 × 455.96
  4. Step 4: Simplify right side
    840.44x = 575,302.97
  5. Step 5: Solve for x
    x = 575,302.97/840.44
  6. Step 6: Final answer
    x = 684.53

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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.