Home / 3,123.20-4,310.16-2,129.60

Finding the Fourth Proportional to 3,123.20, 4,310.16 and 2,129.60

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Solution

The fourth proportional to 3,123.20, 4,310.16 and 2,129.60 is: 2,938.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,123.20 : 4,310.16 = 2,129.60 : x
  2. Step 2: Convert to fraction form
    3,123.20/4,310.16 = 2,129.60/x
  3. Step 3: Cross multiply
    3,123.20x = 4,310.16 × 2,129.60
  4. Step 4: Simplify right side
    3,123.20x = 9,178,916.74
  5. Step 5: Solve for x
    x = 9,178,916.74/3,123.20
  6. Step 6: Final answer
    x = 2,938.95

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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.