Home / 21,511.68-29,685.12-13,128.96

Finding the Fourth Proportional to 21,511.68, 29,685.12 and 13,128.96

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Solution

The fourth proportional to 21,511.68, 29,685.12 and 13,128.96 is: 18,117.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,511.68 : 29,685.12 = 13,128.96 : x
  2. Step 2: Convert to fraction form
    21,511.68/29,685.12 = 13,128.96/x
  3. Step 3: Cross multiply
    21,511.68x = 29,685.12 × 13,128.96
  4. Step 4: Simplify right side
    21,511.68x = 389,734,753.08
  5. Step 5: Solve for x
    x = 389,734,753.08/21,511.68
  6. Step 6: Final answer
    x = 18,117.36

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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.