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Finding the Fourth Proportional to 818.10, 1,128.22 and 548.44

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Solution

The fourth proportional to 818.10, 1,128.22 and 548.44 is: 756.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.10 : 1,128.22 = 548.44 : x
  2. Step 2: Convert to fraction form
    818.10/1,128.22 = 548.44/x
  3. Step 3: Cross multiply
    818.10x = 1,128.22 × 548.44
  4. Step 4: Simplify right side
    818.10x = 618,760.98
  5. Step 5: Solve for x
    x = 618,760.98/818.10
  6. Step 6: Final answer
    x = 756.34

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.