Home / 12,639.12-18,918.69-7,942.87

Finding the Fourth Proportional to 12,639.12, 18,918.69 and 7,942.87

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Solution

The fourth proportional to 12,639.12, 18,918.69 and 7,942.87 is: 11,889.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,639.12 : 18,918.69 = 7,942.87 : x
  2. Step 2: Convert to fraction form
    12,639.12/18,918.69 = 7,942.87/x
  3. Step 3: Cross multiply
    12,639.12x = 18,918.69 × 7,942.87
  4. Step 4: Simplify right side
    12,639.12x = 150,268,689.10
  5. Step 5: Solve for x
    x = 150,268,689.10/12,639.12
  6. Step 6: Final answer
    x = 11,889.18

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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.