Home / 21,240.81-29,311.19-11,680.51

Finding the Fourth Proportional to 21,240.81, 29,311.19 and 11,680.51

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Solution

The fourth proportional to 21,240.81, 29,311.19 and 11,680.51 is: 16,118.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,240.81 : 29,311.19 = 11,680.51 : x
  2. Step 2: Convert to fraction form
    21,240.81/29,311.19 = 11,680.51/x
  3. Step 3: Cross multiply
    21,240.81x = 29,311.19 × 11,680.51
  4. Step 4: Simplify right side
    21,240.81x = 342,369,589.50
  5. Step 5: Solve for x
    x = 342,369,589.50/21,240.81
  6. Step 6: Final answer
    x = 16,118.48

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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.