Home / 28,135.16-42,217.42-20,407.76

Finding the Fourth Proportional to 28,135.16, 42,217.42 and 20,407.76

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Solution

The fourth proportional to 28,135.16, 42,217.42 and 20,407.76 is: 30,622.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,135.16 : 42,217.42 = 20,407.76 : x
  2. Step 2: Convert to fraction form
    28,135.16/42,217.42 = 20,407.76/x
  3. Step 3: Cross multiply
    28,135.16x = 42,217.42 × 20,407.76
  4. Step 4: Simplify right side
    28,135.16x = 861,562,975.18
  5. Step 5: Solve for x
    x = 861,562,975.18/28,135.16
  6. Step 6: Final answer
    x = 30,622.29

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1.5x scale

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.