Home / 28,120.12-42,138.54-12,310.54

Finding the Fourth Proportional to 28,120.12, 42,138.54 and 12,310.54

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Solution

The fourth proportional to 28,120.12, 42,138.54 and 12,310.54 is: 18,447.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,120.12 : 42,138.54 = 12,310.54 : x
  2. Step 2: Convert to fraction form
    28,120.12/42,138.54 = 12,310.54/x
  3. Step 3: Cross multiply
    28,120.12x = 42,138.54 × 12,310.54
  4. Step 4: Simplify right side
    28,120.12x = 518,748,182.21
  5. Step 5: Solve for x
    x = 518,748,182.21/28,120.12
  6. Step 6: Final answer
    x = 18,447.58

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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.