Home / 20,390.98-28,137.88-11,437.26

Finding the Fourth Proportional to 20,390.98, 28,137.88 and 11,437.26

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Solution

The fourth proportional to 20,390.98, 28,137.88 and 11,437.26 is: 15,782.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,390.98 : 28,137.88 = 11,437.26 : x
  2. Step 2: Convert to fraction form
    20,390.98/28,137.88 = 11,437.26/x
  3. Step 3: Cross multiply
    20,390.98x = 28,137.88 × 11,437.26
  4. Step 4: Simplify right side
    20,390.98x = 321,820,249.41
  5. Step 5: Solve for x
    x = 321,820,249.41/20,390.98
  6. Step 6: Final answer
    x = 15,782.48

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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.