Home / 12,378.60-18,519.30-11,212.20

Finding the Fourth Proportional to 12,378.60, 18,519.30 and 11,212.20

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Solution

The fourth proportional to 12,378.60, 18,519.30 and 11,212.20 is: 16,774.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,378.60 : 18,519.30 = 11,212.20 : x
  2. Step 2: Convert to fraction form
    12,378.60/18,519.30 = 11,212.20/x
  3. Step 3: Cross multiply
    12,378.60x = 18,519.30 × 11,212.20
  4. Step 4: Simplify right side
    12,378.60x = 207,642,095.46
  5. Step 5: Solve for x
    x = 207,642,095.46/12,378.60
  6. Step 6: Final answer
    x = 16,774.28

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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.