Home / 20,852.07-28,780.92-12,889.50

Finding the Fourth Proportional to 20,852.07, 28,780.92 and 12,889.50

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Solution

The fourth proportional to 20,852.07, 28,780.92 and 12,889.50 is: 17,790.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,852.07 : 28,780.92 = 12,889.50 : x
  2. Step 2: Convert to fraction form
    20,852.07/28,780.92 = 12,889.50/x
  3. Step 3: Cross multiply
    20,852.07x = 28,780.92 × 12,889.50
  4. Step 4: Simplify right side
    20,852.07x = 370,971,668.34
  5. Step 5: Solve for x
    x = 370,971,668.34/20,852.07
  6. Step 6: Final answer
    x = 17,790.64

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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.