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Finding the Fourth Proportional to 28,064.64, 38,729.02 and 15,489.39

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Solution

The fourth proportional to 28,064.64, 38,729.02 and 15,489.39 is: 21,375.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,064.64 : 38,729.02 = 15,489.39 : x
  2. Step 2: Convert to fraction form
    28,064.64/38,729.02 = 15,489.39/x
  3. Step 3: Cross multiply
    28,064.64x = 38,729.02 × 15,489.39
  4. Step 4: Simplify right side
    28,064.64x = 599,888,895.10
  5. Step 5: Solve for x
    x = 599,888,895.10/28,064.64
  6. Step 6: Final answer
    x = 21,375.26

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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.