Home / 13,140.11-18,133.22-7,171.72

Finding the Fourth Proportional to 13,140.11, 18,133.22 and 7,171.72

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Solution

The fourth proportional to 13,140.11, 18,133.22 and 7,171.72 is: 9,896.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,140.11 : 18,133.22 = 7,171.72 : x
  2. Step 2: Convert to fraction form
    13,140.11/18,133.22 = 7,171.72/x
  3. Step 3: Cross multiply
    13,140.11x = 18,133.22 × 7,171.72
  4. Step 4: Simplify right side
    13,140.11x = 130,046,410.79
  5. Step 5: Solve for x
    x = 130,046,410.79/13,140.11
  6. Step 6: Final answer
    x = 9,896.91

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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.