Home / 18,639.81-27,959.70-12,778.65

Finding the Fourth Proportional to 18,639.81, 27,959.70 and 12,778.65

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Solution

The fourth proportional to 18,639.81, 27,959.70 and 12,778.65 is: 19,167.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,639.81 : 27,959.70 = 12,778.65 : x
  2. Step 2: Convert to fraction form
    18,639.81/27,959.70 = 12,778.65/x
  3. Step 3: Cross multiply
    18,639.81x = 27,959.70 × 12,778.65
  4. Step 4: Simplify right side
    18,639.81x = 357,287,220.41
  5. Step 5: Solve for x
    x = 357,287,220.41/18,639.81
  6. Step 6: Final answer
    x = 19,167.96

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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.