Home / 21,436.12-29,581.92-12,489.76

Finding the Fourth Proportional to 21,436.12, 29,581.92 and 12,489.76

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Solution

The fourth proportional to 21,436.12, 29,581.92 and 12,489.76 is: 17,235.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,436.12 : 29,581.92 = 12,489.76 : x
  2. Step 2: Convert to fraction form
    21,436.12/29,581.92 = 12,489.76/x
  3. Step 3: Cross multiply
    21,436.12x = 29,581.92 × 12,489.76
  4. Step 4: Simplify right side
    21,436.12x = 369,471,081.14
  5. Step 5: Solve for x
    x = 369,471,081.14/21,436.12
  6. Step 6: Final answer
    x = 17,235.91

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.