Home / 21,051.92-31,405.33-20,479.88

Finding the Fourth Proportional to 21,051.92, 31,405.33 and 20,479.88

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Solution

The fourth proportional to 21,051.92, 31,405.33 and 20,479.88 is: 30,551.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,051.92 : 31,405.33 = 20,479.88 : x
  2. Step 2: Convert to fraction form
    21,051.92/31,405.33 = 20,479.88/x
  3. Step 3: Cross multiply
    21,051.92x = 31,405.33 × 20,479.88
  4. Step 4: Simplify right side
    21,051.92x = 643,177,389.76
  5. Step 5: Solve for x
    x = 643,177,389.76/21,051.92
  6. Step 6: Final answer
    x = 30,551.96

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.