Home / 21,145.88-31,665.24-12,707.36

Finding the Fourth Proportional to 21,145.88, 31,665.24 and 12,707.36

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Solution

The fourth proportional to 21,145.88, 31,665.24 and 12,707.36 is: 19,028.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,145.88 : 31,665.24 = 12,707.36 : x
  2. Step 2: Convert to fraction form
    21,145.88/31,665.24 = 12,707.36/x
  3. Step 3: Cross multiply
    21,145.88x = 31,665.24 × 12,707.36
  4. Step 4: Simplify right side
    21,145.88x = 402,381,604.17
  5. Step 5: Solve for x
    x = 402,381,604.17/21,145.88
  6. Step 6: Final answer
    x = 19,028.84

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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.