Home / 20,621.20-28,456.80-11,422.48

Finding the Fourth Proportional to 20,621.20, 28,456.80 and 11,422.48

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Solution

The fourth proportional to 20,621.20, 28,456.80 and 11,422.48 is: 15,762.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,621.20 : 28,456.80 = 11,422.48 : x
  2. Step 2: Convert to fraction form
    20,621.20/28,456.80 = 11,422.48/x
  3. Step 3: Cross multiply
    20,621.20x = 28,456.80 × 11,422.48
  4. Step 4: Simplify right side
    20,621.20x = 325,047,228.86
  5. Step 5: Solve for x
    x = 325,047,228.86/20,621.20
  6. Step 6: Final answer
    x = 15,762.77

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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.