Home / 20,918.93-31,383.86-12,146.29

Finding the Fourth Proportional to 20,918.93, 31,383.86 and 12,146.29

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Solution

The fourth proportional to 20,918.93, 31,383.86 and 12,146.29 is: 18,222.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,918.93 : 31,383.86 = 12,146.29 : x
  2. Step 2: Convert to fraction form
    20,918.93/31,383.86 = 12,146.29/x
  3. Step 3: Cross multiply
    20,918.93x = 31,383.86 × 12,146.29
  4. Step 4: Simplify right side
    20,918.93x = 381,197,325.69
  5. Step 5: Solve for x
    x = 381,197,325.69/20,918.93
  6. Step 6: Final answer
    x = 18,222.61

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1.5x scale

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.