Home / 12,215.20-16,863.12-10,218.40

Finding the Fourth Proportional to 12,215.20, 16,863.12 and 10,218.40

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Solution

The fourth proportional to 12,215.20, 16,863.12 and 10,218.40 is: 14,106.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,215.20 : 16,863.12 = 10,218.40 : x
  2. Step 2: Convert to fraction form
    12,215.20/16,863.12 = 10,218.40/x
  3. Step 3: Cross multiply
    12,215.20x = 16,863.12 × 10,218.40
  4. Step 4: Simplify right side
    12,215.20x = 172,314,105.41
  5. Step 5: Solve for x
    x = 172,314,105.41/12,215.20
  6. Step 6: Final answer
    x = 14,106.53

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.