Home / 20,729.76-28,621.80-12,774.48

Finding the Fourth Proportional to 20,729.76, 28,621.80 and 12,774.48

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Solution

The fourth proportional to 20,729.76, 28,621.80 and 12,774.48 is: 17,637.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,729.76 : 28,621.80 = 12,774.48 : x
  2. Step 2: Convert to fraction form
    20,729.76/28,621.80 = 12,774.48/x
  3. Step 3: Cross multiply
    20,729.76x = 28,621.80 × 12,774.48
  4. Step 4: Simplify right side
    20,729.76x = 365,628,611.66
  5. Step 5: Solve for x
    x = 365,628,611.66/20,729.76
  6. Step 6: Final answer
    x = 17,637.86

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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.