Home / 21,243.35-31,821.27-12,457.08

Finding the Fourth Proportional to 21,243.35, 31,821.27 and 12,457.08

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Solution

The fourth proportional to 21,243.35, 31,821.27 and 12,457.08 is: 18,659.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,243.35 : 31,821.27 = 12,457.08 : x
  2. Step 2: Convert to fraction form
    21,243.35/31,821.27 = 12,457.08/x
  3. Step 3: Cross multiply
    21,243.35x = 31,821.27 × 12,457.08
  4. Step 4: Simplify right side
    21,243.35x = 396,400,106.09
  5. Step 5: Solve for x
    x = 396,400,106.09/21,243.35
  6. Step 6: Final answer
    x = 18,659.96

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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.