Home / 13,311.20-19,966.80-12,663.20

Finding the Fourth Proportional to 13,311.20, 19,966.80 and 12,663.20

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Solution

The fourth proportional to 13,311.20, 19,966.80 and 12,663.20 is: 18,994.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,311.20 : 19,966.80 = 12,663.20 : x
  2. Step 2: Convert to fraction form
    13,311.20/19,966.80 = 12,663.20/x
  3. Step 3: Cross multiply
    13,311.20x = 19,966.80 × 12,663.20
  4. Step 4: Simplify right side
    13,311.20x = 252,843,581.76
  5. Step 5: Solve for x
    x = 252,843,581.76/13,311.20
  6. Step 6: Final answer
    x = 18,994.80

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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.