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Finding the Fourth Proportional to 13,415.40, 20,123.10 and 3,555.68

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Solution

The fourth proportional to 13,415.40, 20,123.10 and 3,555.68 is: 5,333.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,415.40 : 20,123.10 = 3,555.68 : x
  2. Step 2: Convert to fraction form
    13,415.40/20,123.10 = 3,555.68/x
  3. Step 3: Cross multiply
    13,415.40x = 20,123.10 × 3,555.68
  4. Step 4: Simplify right side
    13,415.40x = 71,551,203.59
  5. Step 5: Solve for x
    x = 71,551,203.59/13,415.40
  6. Step 6: Final answer
    x = 5,333.51

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Double scale
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Similar ratio
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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.