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Finding the Fourth Proportional to 20,681.01, 30,978.63 and 10,790.28

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Solution

The fourth proportional to 20,681.01, 30,978.63 and 10,790.28 is: 16,163.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,681.01 : 30,978.63 = 10,790.28 : x
  2. Step 2: Convert to fraction form
    20,681.01/30,978.63 = 10,790.28/x
  3. Step 3: Cross multiply
    20,681.01x = 30,978.63 × 10,790.28
  4. Step 4: Simplify right side
    20,681.01x = 334,268,091.72
  5. Step 5: Solve for x
    x = 334,268,091.72/20,681.01
  6. Step 6: Final answer
    x = 16,163.04

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.