Home / 21,121.84-29,146.96-11,689.84

Finding the Fourth Proportional to 21,121.84, 29,146.96 and 11,689.84

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Solution

The fourth proportional to 21,121.84, 29,146.96 and 11,689.84 is: 16,131.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,121.84 : 29,146.96 = 11,689.84 : x
  2. Step 2: Convert to fraction form
    21,121.84/29,146.96 = 11,689.84/x
  3. Step 3: Cross multiply
    21,121.84x = 29,146.96 × 11,689.84
  4. Step 4: Simplify right side
    21,121.84x = 340,723,298.89
  5. Step 5: Solve for x
    x = 340,723,298.89/21,121.84
  6. Step 6: Final answer
    x = 16,131.33

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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.