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Finding the Fourth Proportional to 828.06, 1,240.26 and 811.45

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Solution

The fourth proportional to 828.06, 1,240.26 and 811.45 is: 1,215.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.06 : 1,240.26 = 811.45 : x
  2. Step 2: Convert to fraction form
    828.06/1,240.26 = 811.45/x
  3. Step 3: Cross multiply
    828.06x = 1,240.26 × 811.45
  4. Step 4: Simplify right side
    828.06x = 1,006,408.98
  5. Step 5: Solve for x
    x = 1,006,408.98/828.06
  6. Step 6: Final answer
    x = 1,215.38

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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.