Home / 20,886-28,821.72-12,507.12

Finding the Fourth Proportional to 20,886, 28,821.72 and 12,507.12

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Solution

The fourth proportional to 20,886, 28,821.72 and 12,507.12 is: 17,259.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,886 : 28,821.72 = 12,507.12 : x
  2. Step 2: Convert to fraction form
    20,886/28,821.72 = 12,507.12/x
  3. Step 3: Cross multiply
    20,886x = 28,821.72 × 12,507.12
  4. Step 4: Simplify right side
    20,886x = 360,476,710.65
  5. Step 5: Solve for x
    x = 360,476,710.65/20,886
  6. Step 6: Final answer
    x = 17,259.25

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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.