Home / 13,137.20-18,128.79-7,471.16

Finding the Fourth Proportional to 13,137.20, 18,128.79 and 7,471.16

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Solution

The fourth proportional to 13,137.20, 18,128.79 and 7,471.16 is: 10,309.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,137.20 : 18,128.79 = 7,471.16 : x
  2. Step 2: Convert to fraction form
    13,137.20/18,128.79 = 7,471.16/x
  3. Step 3: Cross multiply
    13,137.20x = 18,128.79 × 7,471.16
  4. Step 4: Simplify right side
    13,137.20x = 135,443,098.01
  5. Step 5: Solve for x
    x = 135,443,098.01/13,137.20
  6. Step 6: Final answer
    x = 10,309.89

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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.