Home / 28,255.68-42,390-12,465.21

Finding the Fourth Proportional to 28,255.68, 42,390 and 12,465.21

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Solution

The fourth proportional to 28,255.68, 42,390 and 12,465.21 is: 18,700.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,255.68 : 42,390 = 12,465.21 : x
  2. Step 2: Convert to fraction form
    28,255.68/42,390 = 12,465.21/x
  3. Step 3: Cross multiply
    28,255.68x = 42,390 × 12,465.21
  4. Step 4: Simplify right side
    28,255.68x = 528,400,251.90
  5. Step 5: Solve for x
    x = 528,400,251.90/28,255.68
  6. Step 6: Final answer
    x = 18,700.67

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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.