Home / 20,878.16-28,805.52-12,917.60

Finding the Fourth Proportional to 20,878.16, 28,805.52 and 12,917.60

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Solution

The fourth proportional to 20,878.16, 28,805.52 and 12,917.60 is: 17,822.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,878.16 : 28,805.52 = 12,917.60 : x
  2. Step 2: Convert to fraction form
    20,878.16/28,805.52 = 12,917.60/x
  3. Step 3: Cross multiply
    20,878.16x = 28,805.52 × 12,917.60
  4. Step 4: Simplify right side
    20,878.16x = 372,098,185.15
  5. Step 5: Solve for x
    x = 372,098,185.15/20,878.16
  6. Step 6: Final answer
    x = 17,822.36

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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.