Home / 21,108.88-31,674.12-8,638.12

Finding the Fourth Proportional to 21,108.88, 31,674.12 and 8,638.12

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Solution

The fourth proportional to 21,108.88, 31,674.12 and 8,638.12 is: 12,961.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,108.88 : 31,674.12 = 8,638.12 : x
  2. Step 2: Convert to fraction form
    21,108.88/31,674.12 = 8,638.12/x
  3. Step 3: Cross multiply
    21,108.88x = 31,674.12 × 8,638.12
  4. Step 4: Simplify right side
    21,108.88x = 273,604,849.45
  5. Step 5: Solve for x
    x = 273,604,849.45/21,108.88
  6. Step 6: Final answer
    x = 12,961.60

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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.