Home / 20,140.70-30,211.05-12,721.10

Finding the Fourth Proportional to 20,140.70, 30,211.05 and 12,721.10

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Solution

The fourth proportional to 20,140.70, 30,211.05 and 12,721.10 is: 19,081.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,140.70 : 30,211.05 = 12,721.10 : x
  2. Step 2: Convert to fraction form
    20,140.70/30,211.05 = 12,721.10/x
  3. Step 3: Cross multiply
    20,140.70x = 30,211.05 × 12,721.10
  4. Step 4: Simplify right side
    20,140.70x = 384,317,788.16
  5. Step 5: Solve for x
    x = 384,317,788.16/20,140.70
  6. Step 6: Final answer
    x = 19,081.65

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.