Home / 21,328.06-31,981.36-12,446.42

Finding the Fourth Proportional to 21,328.06, 31,981.36 and 12,446.42

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Solution

The fourth proportional to 21,328.06, 31,981.36 and 12,446.42 is: 18,663.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,328.06 : 31,981.36 = 12,446.42 : x
  2. Step 2: Convert to fraction form
    21,328.06/31,981.36 = 12,446.42/x
  3. Step 3: Cross multiply
    21,328.06x = 31,981.36 × 12,446.42
  4. Step 4: Simplify right side
    21,328.06x = 398,053,438.73
  5. Step 5: Solve for x
    x = 398,053,438.73/21,328.06
  6. Step 6: Final answer
    x = 18,663.37

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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.