Home / 25,385.78-38,012.43-20,428.34

Finding the Fourth Proportional to 25,385.78, 38,012.43 and 20,428.34

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Solution

The fourth proportional to 25,385.78, 38,012.43 and 20,428.34 is: 30,589.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,385.78 : 38,012.43 = 20,428.34 : x
  2. Step 2: Convert to fraction form
    25,385.78/38,012.43 = 20,428.34/x
  3. Step 3: Cross multiply
    25,385.78x = 38,012.43 × 20,428.34
  4. Step 4: Simplify right side
    25,385.78x = 776,530,844.27
  5. Step 5: Solve for x
    x = 776,530,844.27/25,385.78
  6. Step 6: Final answer
    x = 30,589.21

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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.