Home / 12,639.18-18,958.78-3,405.18

Finding the Fourth Proportional to 12,639.18, 18,958.78 and 3,405.18

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Solution

The fourth proportional to 12,639.18, 18,958.78 and 3,405.18 is: 5,107.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,639.18 : 18,958.78 = 3,405.18 : x
  2. Step 2: Convert to fraction form
    12,639.18/18,958.78 = 3,405.18/x
  3. Step 3: Cross multiply
    12,639.18x = 18,958.78 × 3,405.18
  4. Step 4: Simplify right side
    12,639.18x = 64,558,058.48
  5. Step 5: Solve for x
    x = 64,558,058.48/12,639.18
  6. Step 6: Final answer
    x = 5,107.77

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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.