Home / 20,780.64-28,673.64-19,729.80

Finding the Fourth Proportional to 20,780.64, 28,673.64 and 19,729.80

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Solution

The fourth proportional to 20,780.64, 28,673.64 and 19,729.80 is: 27,223.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,780.64 : 28,673.64 = 19,729.80 : x
  2. Step 2: Convert to fraction form
    20,780.64/28,673.64 = 19,729.80/x
  3. Step 3: Cross multiply
    20,780.64x = 28,673.64 × 19,729.80
  4. Step 4: Simplify right side
    20,780.64x = 565,725,182.47
  5. Step 5: Solve for x
    x = 565,725,182.47/20,780.64
  6. Step 6: Final answer
    x = 27,223.67

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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.