Home / 20,130.10-30,191.55-12,721.30

Finding the Fourth Proportional to 20,130.10, 30,191.55 and 12,721.30

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Solution

The fourth proportional to 20,130.10, 30,191.55 and 12,721.30 is: 19,079.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,130.10 : 30,191.55 = 12,721.30 : x
  2. Step 2: Convert to fraction form
    20,130.10/30,191.55 = 12,721.30/x
  3. Step 3: Cross multiply
    20,130.10x = 30,191.55 × 12,721.30
  4. Step 4: Simplify right side
    20,130.10x = 384,075,765.02
  5. Step 5: Solve for x
    x = 384,075,765.02/20,130.10
  6. Step 6: Final answer
    x = 19,079.67

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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.