Home / 20,128.90-30,193.26-17,139.51

Finding the Fourth Proportional to 20,128.90, 30,193.26 and 17,139.51

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Solution

The fourth proportional to 20,128.90, 30,193.26 and 17,139.51 is: 25,709.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,128.90 : 30,193.26 = 17,139.51 : x
  2. Step 2: Convert to fraction form
    20,128.90/30,193.26 = 17,139.51/x
  3. Step 3: Cross multiply
    20,128.90x = 30,193.26 × 17,139.51
  4. Step 4: Simplify right side
    20,128.90x = 517,497,681.70
  5. Step 5: Solve for x
    x = 517,497,681.70/20,128.90
  6. Step 6: Final answer
    x = 25,709.19

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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.