Home / 20,108.18-27,731.12-12,555.20

Finding the Fourth Proportional to 20,108.18, 27,731.12 and 12,555.20

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Solution

The fourth proportional to 20,108.18, 27,731.12 and 12,555.20 is: 17,314.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,108.18 : 27,731.12 = 12,555.20 : x
  2. Step 2: Convert to fraction form
    20,108.18/27,731.12 = 12,555.20/x
  3. Step 3: Cross multiply
    20,108.18x = 27,731.12 × 12,555.20
  4. Step 4: Simplify right side
    20,108.18x = 348,169,757.82
  5. Step 5: Solve for x
    x = 348,169,757.82/20,108.18
  6. Step 6: Final answer
    x = 17,314.83

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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.