Home / 21,201.25-31,801.88-12,431.38

Finding the Fourth Proportional to 21,201.25, 31,801.88 and 12,431.38

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Solution

The fourth proportional to 21,201.25, 31,801.88 and 12,431.38 is: 18,647.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,201.25 : 31,801.88 = 12,431.38 : x
  2. Step 2: Convert to fraction form
    21,201.25/31,801.88 = 12,431.38/x
  3. Step 3: Cross multiply
    21,201.25x = 31,801.88 × 12,431.38
  4. Step 4: Simplify right side
    21,201.25x = 395,341,272.34
  5. Step 5: Solve for x
    x = 395,341,272.34/21,201.25
  6. Step 6: Final answer
    x = 18,647.07

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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.