Home / 21,120.33-29,145.65-11,688.96

Finding the Fourth Proportional to 21,120.33, 29,145.65 and 11,688.96

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Solution

The fourth proportional to 21,120.33, 29,145.65 and 11,688.96 is: 16,130.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,120.33 : 29,145.65 = 11,688.96 : x
  2. Step 2: Convert to fraction form
    21,120.33/29,145.65 = 11,688.96/x
  3. Step 3: Cross multiply
    21,120.33x = 29,145.65 × 11,688.96
  4. Step 4: Simplify right side
    21,120.33x = 340,682,278.58
  5. Step 5: Solve for x
    x = 340,682,278.58/21,120.33
  6. Step 6: Final answer
    x = 16,130.54

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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.