Home / 21,172.76-29,221.38-12,218.36

Finding the Fourth Proportional to 21,172.76, 29,221.38 and 12,218.36

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Solution

The fourth proportional to 21,172.76, 29,221.38 and 12,218.36 is: 16,863.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,172.76 : 29,221.38 = 12,218.36 : x
  2. Step 2: Convert to fraction form
    21,172.76/29,221.38 = 12,218.36/x
  3. Step 3: Cross multiply
    21,172.76x = 29,221.38 × 12,218.36
  4. Step 4: Simplify right side
    21,172.76x = 357,037,340.54
  5. Step 5: Solve for x
    x = 357,037,340.54/21,172.76
  6. Step 6: Final answer
    x = 16,863.05

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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.