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Finding the Fourth Proportional to 13,137.95, 18,129.83 and 7,471.91

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Solution

The fourth proportional to 13,137.95, 18,129.83 and 7,471.91 is: 10,310.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,137.95 : 18,129.83 = 7,471.91 : x
  2. Step 2: Convert to fraction form
    13,137.95/18,129.83 = 7,471.91/x
  3. Step 3: Cross multiply
    13,137.95x = 18,129.83 × 7,471.91
  4. Step 4: Simplify right side
    13,137.95x = 135,464,466.04
  5. Step 5: Solve for x
    x = 135,464,466.04/13,137.95
  6. Step 6: Final answer
    x = 10,310.93

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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.