Home / 20,751.15-31,128.48-8,905.44

Finding the Fourth Proportional to 20,751.15, 31,128.48 and 8,905.44

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Solution

The fourth proportional to 20,751.15, 31,128.48 and 8,905.44 is: 13,358.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,751.15 : 31,128.48 = 8,905.44 : x
  2. Step 2: Convert to fraction form
    20,751.15/31,128.48 = 8,905.44/x
  3. Step 3: Cross multiply
    20,751.15x = 31,128.48 × 8,905.44
  4. Step 4: Simplify right side
    20,751.15x = 277,212,810.93
  5. Step 5: Solve for x
    x = 277,212,810.93/20,751.15
  6. Step 6: Final answer
    x = 13,358.91

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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.