Home / 20,878.60-28,796.34-12,486.28

Finding the Fourth Proportional to 20,878.60, 28,796.34 and 12,486.28

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Solution

The fourth proportional to 20,878.60, 28,796.34 and 12,486.28 is: 17,221.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,878.60 : 28,796.34 = 12,486.28 : x
  2. Step 2: Convert to fraction form
    20,878.60/28,796.34 = 12,486.28/x
  3. Step 3: Cross multiply
    20,878.60x = 28,796.34 × 12,486.28
  4. Step 4: Simplify right side
    20,878.60x = 359,559,164.22
  5. Step 5: Solve for x
    x = 359,559,164.22/20,878.60
  6. Step 6: Final answer
    x = 17,221.42

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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.