Home / 20,869.64-28,800.05-11,309.79

Finding the Fourth Proportional to 20,869.64, 28,800.05 and 11,309.79

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Solution

The fourth proportional to 20,869.64, 28,800.05 and 11,309.79 is: 15,607.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,869.64 : 28,800.05 = 11,309.79 : x
  2. Step 2: Convert to fraction form
    20,869.64/28,800.05 = 11,309.79/x
  3. Step 3: Cross multiply
    20,869.64x = 28,800.05 × 11,309.79
  4. Step 4: Simplify right side
    20,869.64x = 325,722,460.94
  5. Step 5: Solve for x
    x = 325,722,460.94/20,869.64
  6. Step 6: Final answer
    x = 15,607.48

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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.