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Finding the Fourth Proportional to 20,672.65, 28,528.54 and 11,719.96

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Solution

The fourth proportional to 20,672.65, 28,528.54 and 11,719.96 is: 16,173.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,672.65 : 28,528.54 = 11,719.96 : x
  2. Step 2: Convert to fraction form
    20,672.65/28,528.54 = 11,719.96/x
  3. Step 3: Cross multiply
    20,672.65x = 28,528.54 × 11,719.96
  4. Step 4: Simplify right side
    20,672.65x = 334,353,247.04
  5. Step 5: Solve for x
    x = 334,353,247.04/20,672.65
  6. Step 6: Final answer
    x = 16,173.70

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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.