Home / 21,120.45-29,143.17-11,688.99

Finding the Fourth Proportional to 21,120.45, 29,143.17 and 11,688.99

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Solution

The fourth proportional to 21,120.45, 29,143.17 and 11,688.99 is: 16,129.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,120.45 : 29,143.17 = 11,688.99 : x
  2. Step 2: Convert to fraction form
    21,120.45/29,143.17 = 11,688.99/x
  3. Step 3: Cross multiply
    21,120.45x = 29,143.17 × 11,688.99
  4. Step 4: Simplify right side
    21,120.45x = 340,654,222.70
  5. Step 5: Solve for x
    x = 340,654,222.70/21,120.45
  6. Step 6: Final answer
    x = 16,129.12

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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.