Home / 21,000.16-31,438.80-12,736.48

Finding the Fourth Proportional to 21,000.16, 31,438.80 and 12,736.48

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Solution

The fourth proportional to 21,000.16, 31,438.80 and 12,736.48 is: 19,067.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,000.16 : 31,438.80 = 12,736.48 : x
  2. Step 2: Convert to fraction form
    21,000.16/31,438.80 = 12,736.48/x
  3. Step 3: Cross multiply
    21,000.16x = 31,438.80 × 12,736.48
  4. Step 4: Simplify right side
    21,000.16x = 400,419,647.42
  5. Step 5: Solve for x
    x = 400,419,647.42/21,000.16
  6. Step 6: Final answer
    x = 19,067.46

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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.