Home / 21,120.70-29,143.52-11,689.24

Finding the Fourth Proportional to 21,120.70, 29,143.52 and 11,689.24

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Solution

The fourth proportional to 21,120.70, 29,143.52 and 11,689.24 is: 16,129.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,120.70 : 29,143.52 = 11,689.24 : x
  2. Step 2: Convert to fraction form
    21,120.70/29,143.52 = 11,689.24/x
  3. Step 3: Cross multiply
    21,120.70x = 29,143.52 × 11,689.24
  4. Step 4: Simplify right side
    21,120.70x = 340,665,541.28
  5. Step 5: Solve for x
    x = 340,665,541.28/21,120.70
  6. Step 6: Final answer
    x = 16,129.46

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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.