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Finding the Fourth Proportional to 843.53, 1,271.78 and 828.41

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Solution

The fourth proportional to 843.53, 1,271.78 and 828.41 is: 1,248.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    843.53 : 1,271.78 = 828.41 : x
  2. Step 2: Convert to fraction form
    843.53/1,271.78 = 828.41/x
  3. Step 3: Cross multiply
    843.53x = 1,271.78 × 828.41
  4. Step 4: Simplify right side
    843.53x = 1,053,547.88
  5. Step 5: Solve for x
    x = 1,053,547.88/843.53
  6. Step 6: Final answer
    x = 1,248.98

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.