Home / 20,490.87-28,277.92-11,538.69

Finding the Fourth Proportional to 20,490.87, 28,277.92 and 11,538.69

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Solution

The fourth proportional to 20,490.87, 28,277.92 and 11,538.69 is: 15,923.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,490.87 : 28,277.92 = 11,538.69 : x
  2. Step 2: Convert to fraction form
    20,490.87/28,277.92 = 11,538.69/x
  3. Step 3: Cross multiply
    20,490.87x = 28,277.92 × 11,538.69
  4. Step 4: Simplify right side
    20,490.87x = 326,290,152.72
  5. Step 5: Solve for x
    x = 326,290,152.72/20,490.87
  6. Step 6: Final answer
    x = 15,923.68

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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.