Home / 20,872.36-31,312.86-7,021

Finding the Fourth Proportional to 20,872.36, 31,312.86 and 7,021

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Solution

The fourth proportional to 20,872.36, 31,312.86 and 7,021 is: 10,532.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,872.36 : 31,312.86 = 7,021 : x
  2. Step 2: Convert to fraction form
    20,872.36/31,312.86 = 7,021/x
  3. Step 3: Cross multiply
    20,872.36x = 31,312.86 × 7,021
  4. Step 4: Simplify right side
    20,872.36x = 219,847,590.06
  5. Step 5: Solve for x
    x = 219,847,590.06/20,872.36
  6. Step 6: Final answer
    x = 10,532.95

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.