Home / 5,456.21-8,178.71-2,123.55

Finding the Fourth Proportional to 5,456.21, 8,178.71 and 2,123.55

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Solution

The fourth proportional to 5,456.21, 8,178.71 and 2,123.55 is: 3,183.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,456.21 : 8,178.71 = 2,123.55 : x
  2. Step 2: Convert to fraction form
    5,456.21/8,178.71 = 2,123.55/x
  3. Step 3: Cross multiply
    5,456.21x = 8,178.71 × 2,123.55
  4. Step 4: Simplify right side
    5,456.21x = 17,367,889.00
  5. Step 5: Solve for x
    x = 17,367,889.00/5,456.21
  6. Step 6: Final answer
    x = 3,183.14

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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.