Home / 13,421.40-20,129.70-8,482.20

Finding the Fourth Proportional to 13,421.40, 20,129.70 and 8,482.20

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Solution

The fourth proportional to 13,421.40, 20,129.70 and 8,482.20 is: 12,721.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,421.40 : 20,129.70 = 8,482.20 : x
  2. Step 2: Convert to fraction form
    13,421.40/20,129.70 = 8,482.20/x
  3. Step 3: Cross multiply
    13,421.40x = 20,129.70 × 8,482.20
  4. Step 4: Simplify right side
    13,421.40x = 170,744,141.34
  5. Step 5: Solve for x
    x = 170,744,141.34/13,421.40
  6. Step 6: Final answer
    x = 12,721.78

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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.