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Finding the Fourth Proportional to 15,112.76, 20,816.46 and 12,719.79

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Solution

The fourth proportional to 15,112.76, 20,816.46 and 12,719.79 is: 17,520.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,112.76 : 20,816.46 = 12,719.79 : x
  2. Step 2: Convert to fraction form
    15,112.76/20,816.46 = 12,719.79/x
  3. Step 3: Cross multiply
    15,112.76x = 20,816.46 × 12,719.79
  4. Step 4: Simplify right side
    15,112.76x = 264,780,999.74
  5. Step 5: Solve for x
    x = 264,780,999.74/15,112.76
  6. Step 6: Final answer
    x = 17,520.37

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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.