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Finding the Fourth Proportional to 20,998.65, 28,977.89 and 11,567.01

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Solution

The fourth proportional to 20,998.65, 28,977.89 and 11,567.01 is: 15,962.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,998.65 : 28,977.89 = 11,567.01 : x
  2. Step 2: Convert to fraction form
    20,998.65/28,977.89 = 11,567.01/x
  3. Step 3: Cross multiply
    20,998.65x = 28,977.89 × 11,567.01
  4. Step 4: Simplify right side
    20,998.65x = 335,187,485.57
  5. Step 5: Solve for x
    x = 335,187,485.57/20,998.65
  6. Step 6: Final answer
    x = 15,962.33

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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.