Home / 28,137.86-38,828.79-15,388.57

Finding the Fourth Proportional to 28,137.86, 38,828.79 and 15,388.57

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Solution

The fourth proportional to 28,137.86, 38,828.79 and 15,388.57 is: 21,235.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,137.86 : 38,828.79 = 15,388.57 : x
  2. Step 2: Convert to fraction form
    28,137.86/38,828.79 = 15,388.57/x
  3. Step 3: Cross multiply
    28,137.86x = 38,828.79 × 15,388.57
  4. Step 4: Simplify right side
    28,137.86x = 597,519,552.93
  5. Step 5: Solve for x
    x = 597,519,552.93/28,137.86
  6. Step 6: Final answer
    x = 21,235.43

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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.