Home / 21,859.80-30,166.44-12,909.36

Finding the Fourth Proportional to 21,859.80, 30,166.44 and 12,909.36

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Solution

The fourth proportional to 21,859.80, 30,166.44 and 12,909.36 is: 17,814.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,859.80 : 30,166.44 = 12,909.36 : x
  2. Step 2: Convert to fraction form
    21,859.80/30,166.44 = 12,909.36/x
  3. Step 3: Cross multiply
    21,859.80x = 30,166.44 × 12,909.36
  4. Step 4: Simplify right side
    21,859.80x = 389,429,433.88
  5. Step 5: Solve for x
    x = 389,429,433.88/21,859.80
  6. Step 6: Final answer
    x = 17,814.87

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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.