Home / 21,120.35-29,145.83-11,689.11

Finding the Fourth Proportional to 21,120.35, 29,145.83 and 11,689.11

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Solution

The fourth proportional to 21,120.35, 29,145.83 and 11,689.11 is: 16,130.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,120.35 : 29,145.83 = 11,689.11 : x
  2. Step 2: Convert to fraction form
    21,120.35/29,145.83 = 11,689.11/x
  3. Step 3: Cross multiply
    21,120.35x = 29,145.83 × 11,689.11
  4. Step 4: Simplify right side
    21,120.35x = 340,688,754.47
  5. Step 5: Solve for x
    x = 340,688,754.47/21,120.35
  6. Step 6: Final answer
    x = 16,130.83

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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.