Home / 20,738.90-28,609.28-13,172.89

Finding the Fourth Proportional to 20,738.90, 28,609.28 and 13,172.89

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Solution

The fourth proportional to 20,738.90, 28,609.28 and 13,172.89 is: 18,171.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,738.90 : 28,609.28 = 13,172.89 : x
  2. Step 2: Convert to fraction form
    20,738.90/28,609.28 = 13,172.89/x
  3. Step 3: Cross multiply
    20,738.90x = 28,609.28 × 13,172.89
  4. Step 4: Simplify right side
    20,738.90x = 376,866,898.42
  5. Step 5: Solve for x
    x = 376,866,898.42/20,738.90
  6. Step 6: Final answer
    x = 18,171.98

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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.