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Finding the Fourth Proportional to 840.90, 1,261.56 and 826.95

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Solution

The fourth proportional to 840.90, 1,261.56 and 826.95 is: 1,240.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.90 : 1,261.56 = 826.95 : x
  2. Step 2: Convert to fraction form
    840.90/1,261.56 = 826.95/x
  3. Step 3: Cross multiply
    840.90x = 1,261.56 × 826.95
  4. Step 4: Simplify right side
    840.90x = 1,043,243.89
  5. Step 5: Solve for x
    x = 1,043,243.89/840.90
  6. Step 6: Final answer
    x = 1,240.63

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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.