Home / 15,708.80-21,679.08-8,635.76

Finding the Fourth Proportional to 15,708.80, 21,679.08 and 8,635.76

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Solution

The fourth proportional to 15,708.80, 21,679.08 and 8,635.76 is: 11,917.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,708.80 : 21,679.08 = 8,635.76 : x
  2. Step 2: Convert to fraction form
    15,708.80/21,679.08 = 8,635.76/x
  3. Step 3: Cross multiply
    15,708.80x = 21,679.08 × 8,635.76
  4. Step 4: Simplify right side
    15,708.80x = 187,215,331.90
  5. Step 5: Solve for x
    x = 187,215,331.90/15,708.80
  6. Step 6: Final answer
    x = 11,917.86

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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.