Home / 21,296.68-31,920.79-12,958.31

Finding the Fourth Proportional to 21,296.68, 31,920.79 and 12,958.31

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Solution

The fourth proportional to 21,296.68, 31,920.79 and 12,958.31 is: 19,422.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,296.68 : 31,920.79 = 12,958.31 : x
  2. Step 2: Convert to fraction form
    21,296.68/31,920.79 = 12,958.31/x
  3. Step 3: Cross multiply
    21,296.68x = 31,920.79 × 12,958.31
  4. Step 4: Simplify right side
    21,296.68x = 413,639,492.26
  5. Step 5: Solve for x
    x = 413,639,492.26/21,296.68
  6. Step 6: Final answer
    x = 19,422.72

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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.