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Finding the Fourth Proportional to 20,803.78, 28,707.54 and 11,849.50

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Solution

The fourth proportional to 20,803.78, 28,707.54 and 11,849.50 is: 16,351.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,803.78 : 28,707.54 = 11,849.50 : x
  2. Step 2: Convert to fraction form
    20,803.78/28,707.54 = 11,849.50/x
  3. Step 3: Cross multiply
    20,803.78x = 28,707.54 × 11,849.50
  4. Step 4: Simplify right side
    20,803.78x = 340,169,995.23
  5. Step 5: Solve for x
    x = 340,169,995.23/20,803.78
  6. Step 6: Final answer
    x = 16,351.36

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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.