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Finding the Fourth Proportional to 20,872.99, 28,803.69 and 11,798.15

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Solution

The fourth proportional to 20,872.99, 28,803.69 and 11,798.15 is: 16,280.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,872.99 : 28,803.69 = 11,798.15 : x
  2. Step 2: Convert to fraction form
    20,872.99/28,803.69 = 11,798.15/x
  3. Step 3: Cross multiply
    20,872.99x = 28,803.69 × 11,798.15
  4. Step 4: Simplify right side
    20,872.99x = 339,830,327.18
  5. Step 5: Solve for x
    x = 339,830,327.18/20,872.99
  6. Step 6: Final answer
    x = 16,280.87

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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.