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Finding the Fourth Proportional to 28,496.80, 42,745.20 and 15,374.80

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Solution

The fourth proportional to 28,496.80, 42,745.20 and 15,374.80 is: 23,062.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,496.80 : 42,745.20 = 15,374.80 : x
  2. Step 2: Convert to fraction form
    28,496.80/42,745.20 = 15,374.80/x
  3. Step 3: Cross multiply
    28,496.80x = 42,745.20 × 15,374.80
  4. Step 4: Simplify right side
    28,496.80x = 657,198,900.96
  5. Step 5: Solve for x
    x = 657,198,900.96/28,496.80
  6. Step 6: Final answer
    x = 23,062.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.