Home / 20,871.20-28,803.36-11,440.16

Finding the Fourth Proportional to 20,871.20, 28,803.36 and 11,440.16

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Solution

The fourth proportional to 20,871.20, 28,803.36 and 11,440.16 is: 15,788.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,871.20 : 28,803.36 = 11,440.16 : x
  2. Step 2: Convert to fraction form
    20,871.20/28,803.36 = 11,440.16/x
  3. Step 3: Cross multiply
    20,871.20x = 28,803.36 × 11,440.16
  4. Step 4: Simplify right side
    20,871.20x = 329,515,046.94
  5. Step 5: Solve for x
    x = 329,515,046.94/20,871.20
  6. Step 6: Final answer
    x = 15,788.03

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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.