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Finding the Fourth Proportional to 28,118.40, 42,163.20 and 10,579.20

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Solution

The fourth proportional to 28,118.40, 42,163.20 and 10,579.20 is: 15,863.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,118.40 : 42,163.20 = 10,579.20 : x
  2. Step 2: Convert to fraction form
    28,118.40/42,163.20 = 10,579.20/x
  3. Step 3: Cross multiply
    28,118.40x = 42,163.20 × 10,579.20
  4. Step 4: Simplify right side
    28,118.40x = 446,052,925.44
  5. Step 5: Solve for x
    x = 446,052,925.44/28,118.40
  6. Step 6: Final answer
    x = 15,863.38

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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.