Home / 12,139.36-18,185.72-7,445.68

Finding the Fourth Proportional to 12,139.36, 18,185.72 and 7,445.68

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Solution

The fourth proportional to 12,139.36, 18,185.72 and 7,445.68 is: 11,154.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,139.36 : 18,185.72 = 7,445.68 : x
  2. Step 2: Convert to fraction form
    12,139.36/18,185.72 = 7,445.68/x
  3. Step 3: Cross multiply
    12,139.36x = 18,185.72 × 7,445.68
  4. Step 4: Simplify right side
    12,139.36x = 135,404,969.00
  5. Step 5: Solve for x
    x = 135,404,969.00/12,139.36
  6. Step 6: Final answer
    x = 11,154.21

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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.