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Finding the Fourth Proportional to 3,438.40, 5,179.51 and 3,139.51

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Solution

The fourth proportional to 3,438.40, 5,179.51 and 3,139.51 is: 4,729.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,438.40 : 5,179.51 = 3,139.51 : x
  2. Step 2: Convert to fraction form
    3,438.40/5,179.51 = 3,139.51/x
  3. Step 3: Cross multiply
    3,438.40x = 5,179.51 × 3,139.51
  4. Step 4: Simplify right side
    3,438.40x = 16,261,123.44
  5. Step 5: Solve for x
    x = 16,261,123.44/3,438.40
  6. Step 6: Final answer
    x = 4,729.27

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Half scale
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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.