Home / 20,653.20-28,501.20-11,221.80

Finding the Fourth Proportional to 20,653.20, 28,501.20 and 11,221.80

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Solution

The fourth proportional to 20,653.20, 28,501.20 and 11,221.80 is: 15,485.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,653.20 : 28,501.20 = 11,221.80 : x
  2. Step 2: Convert to fraction form
    20,653.20/28,501.20 = 11,221.80/x
  3. Step 3: Cross multiply
    20,653.20x = 28,501.20 × 11,221.80
  4. Step 4: Simplify right side
    20,653.20x = 319,834,766.16
  5. Step 5: Solve for x
    x = 319,834,766.16/20,653.20
  6. Step 6: Final answer
    x = 15,485.97

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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.