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Finding the Fourth Proportional to 28,072.88, 38,739.60 and 15,497.60

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Solution

The fourth proportional to 28,072.88, 38,739.60 and 15,497.60 is: 21,386.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,072.88 : 38,739.60 = 15,497.60 : x
  2. Step 2: Convert to fraction form
    28,072.88/38,739.60 = 15,497.60/x
  3. Step 3: Cross multiply
    28,072.88x = 38,739.60 × 15,497.60
  4. Step 4: Simplify right side
    28,072.88x = 600,370,824.96
  5. Step 5: Solve for x
    x = 600,370,824.96/28,072.88
  6. Step 6: Final answer
    x = 21,386.15

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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.