Home / 20,686.81-28,548.09-11,255.38

Finding the Fourth Proportional to 20,686.81, 28,548.09 and 11,255.38

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Solution

The fourth proportional to 20,686.81, 28,548.09 and 11,255.38 is: 15,532.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,686.81 : 28,548.09 = 11,255.38 : x
  2. Step 2: Convert to fraction form
    20,686.81/28,548.09 = 11,255.38/x
  3. Step 3: Cross multiply
    20,686.81x = 28,548.09 × 11,255.38
  4. Step 4: Simplify right side
    20,686.81x = 321,319,601.22
  5. Step 5: Solve for x
    x = 321,319,601.22/20,686.81
  6. Step 6: Final answer
    x = 15,532.58

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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.