Home / 20,390.19-28,137.99-11,437.48

Finding the Fourth Proportional to 20,390.19, 28,137.99 and 11,437.48

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Solution

The fourth proportional to 20,390.19, 28,137.99 and 11,437.48 is: 15,783.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,390.19 : 28,137.99 = 11,437.48 : x
  2. Step 2: Convert to fraction form
    20,390.19/28,137.99 = 11,437.48/x
  3. Step 3: Cross multiply
    20,390.19x = 28,137.99 × 11,437.48
  4. Step 4: Simplify right side
    20,390.19x = 321,827,697.87
  5. Step 5: Solve for x
    x = 321,827,697.87/20,390.19
  6. Step 6: Final answer
    x = 15,783.46

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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.