Home / 20,760.76-28,639.38-12,790.36

Finding the Fourth Proportional to 20,760.76, 28,639.38 and 12,790.36

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Solution

The fourth proportional to 20,760.76, 28,639.38 and 12,790.36 is: 17,644.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,760.76 : 28,639.38 = 12,790.36 : x
  2. Step 2: Convert to fraction form
    20,760.76/28,639.38 = 12,790.36/x
  3. Step 3: Cross multiply
    20,760.76x = 28,639.38 × 12,790.36
  4. Step 4: Simplify right side
    20,760.76x = 366,307,980.38
  5. Step 5: Solve for x
    x = 366,307,980.38/20,760.76
  6. Step 6: Final answer
    x = 17,644.25

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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.