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Finding the Fourth Proportional to 20,639.37, 28,482.08 and 11,208

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Solution

The fourth proportional to 20,639.37, 28,482.08 and 11,208 is: 15,466.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,639.37 : 28,482.08 = 11,208 : x
  2. Step 2: Convert to fraction form
    20,639.37/28,482.08 = 11,208/x
  3. Step 3: Cross multiply
    20,639.37x = 28,482.08 × 11,208
  4. Step 4: Simplify right side
    20,639.37x = 319,227,152.64
  5. Step 5: Solve for x
    x = 319,227,152.64/20,639.37
  6. Step 6: Final answer
    x = 15,466.90

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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.