Home / 21,071.45-29,080.13-12,121.76

Finding the Fourth Proportional to 21,071.45, 29,080.13 and 12,121.76

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Solution

The fourth proportional to 21,071.45, 29,080.13 and 12,121.76 is: 16,728.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,071.45 : 29,080.13 = 12,121.76 : x
  2. Step 2: Convert to fraction form
    21,071.45/29,080.13 = 12,121.76/x
  3. Step 3: Cross multiply
    21,071.45x = 29,080.13 × 12,121.76
  4. Step 4: Simplify right side
    21,071.45x = 352,502,150.62
  5. Step 5: Solve for x
    x = 352,502,150.62/21,071.45
  6. Step 6: Final answer
    x = 16,728.90

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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.