Home / 20,916-31,386.96-12,155.04

Finding the Fourth Proportional to 20,916, 31,386.96 and 12,155.04

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Solution

The fourth proportional to 20,916, 31,386.96 and 12,155.04 is: 18,240.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,916 : 31,386.96 = 12,155.04 : x
  2. Step 2: Convert to fraction form
    20,916/31,386.96 = 12,155.04/x
  3. Step 3: Cross multiply
    20,916x = 31,386.96 × 12,155.04
  4. Step 4: Simplify right side
    20,916x = 381,509,754.28
  5. Step 5: Solve for x
    x = 381,509,754.28/20,916
  6. Step 6: Final answer
    x = 18,240.09

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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.