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Finding the Fourth Proportional to 2,271.90, 3,406.80 and 811.08

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Solution

The fourth proportional to 2,271.90, 3,406.80 and 811.08 is: 1,216.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,271.90 : 3,406.80 = 811.08 : x
  2. Step 2: Convert to fraction form
    2,271.90/3,406.80 = 811.08/x
  3. Step 3: Cross multiply
    2,271.90x = 3,406.80 × 811.08
  4. Step 4: Simplify right side
    2,271.90x = 2,763,187.34
  5. Step 5: Solve for x
    x = 2,763,187.34/2,271.90
  6. Step 6: Final answer
    x = 1,216.25

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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.