Home / 21,121.16-29,148.12-11,689.72

Finding the Fourth Proportional to 21,121.16, 29,148.12 and 11,689.72

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Solution

The fourth proportional to 21,121.16, 29,148.12 and 11,689.72 is: 16,132.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,121.16 : 29,148.12 = 11,689.72 : x
  2. Step 2: Convert to fraction form
    21,121.16/29,148.12 = 11,689.72/x
  3. Step 3: Cross multiply
    21,121.16x = 29,148.12 × 11,689.72
  4. Step 4: Simplify right side
    21,121.16x = 340,733,361.33
  5. Step 5: Solve for x
    x = 340,733,361.33/21,121.16
  6. Step 6: Final answer
    x = 16,132.32

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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.