Home / 20,412.80-28,169.88-11,915.36

Finding the Fourth Proportional to 20,412.80, 28,169.88 and 11,915.36

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Solution

The fourth proportional to 20,412.80, 28,169.88 and 11,915.36 is: 16,443.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,412.80 : 28,169.88 = 11,915.36 : x
  2. Step 2: Convert to fraction form
    20,412.80/28,169.88 = 11,915.36/x
  3. Step 3: Cross multiply
    20,412.80x = 28,169.88 × 11,915.36
  4. Step 4: Simplify right side
    20,412.80x = 335,654,261.36
  5. Step 5: Solve for x
    x = 335,654,261.36/20,412.80
  6. Step 6: Final answer
    x = 16,443.32

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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.