Home / 20,554.34-28,380.90-13,387.66

Finding the Fourth Proportional to 20,554.34, 28,380.90 and 13,387.66

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Solution

The fourth proportional to 20,554.34, 28,380.90 and 13,387.66 is: 18,485.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,554.34 : 28,380.90 = 13,387.66 : x
  2. Step 2: Convert to fraction form
    20,554.34/28,380.90 = 13,387.66/x
  3. Step 3: Cross multiply
    20,554.34x = 28,380.90 × 13,387.66
  4. Step 4: Simplify right side
    20,554.34x = 379,953,839.69
  5. Step 5: Solve for x
    x = 379,953,839.69/20,554.34
  6. Step 6: Final answer
    x = 18,485.33

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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.