Home / 21,143.12-29,178.28-11,712.56

Finding the Fourth Proportional to 21,143.12, 29,178.28 and 11,712.56

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Solution

The fourth proportional to 21,143.12, 29,178.28 and 11,712.56 is: 16,163.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,143.12 : 29,178.28 = 11,712.56 : x
  2. Step 2: Convert to fraction form
    21,143.12/29,178.28 = 11,712.56/x
  3. Step 3: Cross multiply
    21,143.12x = 29,178.28 × 11,712.56
  4. Step 4: Simplify right side
    21,143.12x = 341,752,355.20
  5. Step 5: Solve for x
    x = 341,752,355.20/21,143.12
  6. Step 6: Final answer
    x = 16,163.76

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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.