Home / 13,215.90-18,238.79-8,731.80

Finding the Fourth Proportional to 13,215.90, 18,238.79 and 8,731.80

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Solution

The fourth proportional to 13,215.90, 18,238.79 and 8,731.80 is: 12,050.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,215.90 : 18,238.79 = 8,731.80 : x
  2. Step 2: Convert to fraction form
    13,215.90/18,238.79 = 8,731.80/x
  3. Step 3: Cross multiply
    13,215.90x = 18,238.79 × 8,731.80
  4. Step 4: Simplify right side
    13,215.90x = 159,257,422.86
  5. Step 5: Solve for x
    x = 159,257,422.86/13,215.90
  6. Step 6: Final answer
    x = 12,050.44

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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.