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Finding the Fourth Proportional to 3,276.42, 4,914.45 and 811.23

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Solution

The fourth proportional to 3,276.42, 4,914.45 and 811.23 is: 1,216.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,276.42 : 4,914.45 = 811.23 : x
  2. Step 2: Convert to fraction form
    3,276.42/4,914.45 = 811.23/x
  3. Step 3: Cross multiply
    3,276.42x = 4,914.45 × 811.23
  4. Step 4: Simplify right side
    3,276.42x = 3,986,749.27
  5. Step 5: Solve for x
    x = 3,986,749.27/3,276.42
  6. Step 6: Final answer
    x = 1,216.80

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1.5x scale

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.