Home / 20,603.31-30,828.42-12,287.85

Finding the Fourth Proportional to 20,603.31, 30,828.42 and 12,287.85

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Solution

The fourth proportional to 20,603.31, 30,828.42 and 12,287.85 is: 18,386.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,603.31 : 30,828.42 = 12,287.85 : x
  2. Step 2: Convert to fraction form
    20,603.31/30,828.42 = 12,287.85/x
  3. Step 3: Cross multiply
    20,603.31x = 30,828.42 × 12,287.85
  4. Step 4: Simplify right side
    20,603.31x = 378,814,939.26
  5. Step 5: Solve for x
    x = 378,814,939.26/20,603.31
  6. Step 6: Final answer
    x = 18,386.12

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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.