Home / 20,930.12-28,891.14-13,858.82

Finding the Fourth Proportional to 20,930.12, 28,891.14 and 13,858.82

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Solution

The fourth proportional to 20,930.12, 28,891.14 and 13,858.82 is: 19,130.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,930.12 : 28,891.14 = 13,858.82 : x
  2. Step 2: Convert to fraction form
    20,930.12/28,891.14 = 13,858.82/x
  3. Step 3: Cross multiply
    20,930.12x = 28,891.14 × 13,858.82
  4. Step 4: Simplify right side
    20,930.12x = 400,397,108.85
  5. Step 5: Solve for x
    x = 400,397,108.85/20,930.12
  6. Step 6: Final answer
    x = 19,130.19

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.