Home / 15,711.88-21,682.43-8,638.35

Finding the Fourth Proportional to 15,711.88, 21,682.43 and 8,638.35

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Solution

The fourth proportional to 15,711.88, 21,682.43 and 8,638.35 is: 11,920.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,711.88 : 21,682.43 = 8,638.35 : x
  2. Step 2: Convert to fraction form
    15,711.88/21,682.43 = 8,638.35/x
  3. Step 3: Cross multiply
    15,711.88x = 21,682.43 × 8,638.35
  4. Step 4: Simplify right side
    15,711.88x = 187,300,376.00
  5. Step 5: Solve for x
    x = 187,300,376.00/15,711.88
  6. Step 6: Final answer
    x = 11,920.94

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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.