Home / 20,521.88-28,313.90-12,555.80

Finding the Fourth Proportional to 20,521.88, 28,313.90 and 12,555.80

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Solution

The fourth proportional to 20,521.88, 28,313.90 and 12,555.80 is: 17,323.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,521.88 : 28,313.90 = 12,555.80 : x
  2. Step 2: Convert to fraction form
    20,521.88/28,313.90 = 12,555.80/x
  3. Step 3: Cross multiply
    20,521.88x = 28,313.90 × 12,555.80
  4. Step 4: Simplify right side
    20,521.88x = 355,503,665.62
  5. Step 5: Solve for x
    x = 355,503,665.62/20,521.88
  6. Step 6: Final answer
    x = 17,323.15

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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.