Home / 20,980.69-28,953.35-11,420.61

Finding the Fourth Proportional to 20,980.69, 28,953.35 and 11,420.61

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Solution

The fourth proportional to 20,980.69, 28,953.35 and 11,420.61 is: 15,760.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,980.69 : 28,953.35 = 11,420.61 : x
  2. Step 2: Convert to fraction form
    20,980.69/28,953.35 = 11,420.61/x
  3. Step 3: Cross multiply
    20,980.69x = 28,953.35 × 11,420.61
  4. Step 4: Simplify right side
    20,980.69x = 330,664,918.54
  5. Step 5: Solve for x
    x = 330,664,918.54/20,980.69
  6. Step 6: Final answer
    x = 15,760.44

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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.