Home / 21,142.80-29,087.64-20,559.60

Finding the Fourth Proportional to 21,142.80, 29,087.64 and 20,559.60

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Solution

The fourth proportional to 21,142.80, 29,087.64 and 20,559.60 is: 28,285.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,142.80 : 29,087.64 = 20,559.60 : x
  2. Step 2: Convert to fraction form
    21,142.80/29,087.64 = 20,559.60/x
  3. Step 3: Cross multiply
    21,142.80x = 29,087.64 × 20,559.60
  4. Step 4: Simplify right side
    21,142.80x = 598,030,243.34
  5. Step 5: Solve for x
    x = 598,030,243.34/21,142.80
  6. Step 6: Final answer
    x = 28,285.29

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Similar ratio
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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.