Home / 20,890.27-31,303.99-12,561.18

Finding the Fourth Proportional to 20,890.27, 31,303.99 and 12,561.18

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Solution

The fourth proportional to 20,890.27, 31,303.99 and 12,561.18 is: 18,822.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,890.27 : 31,303.99 = 12,561.18 : x
  2. Step 2: Convert to fraction form
    20,890.27/31,303.99 = 12,561.18/x
  3. Step 3: Cross multiply
    20,890.27x = 31,303.99 × 12,561.18
  4. Step 4: Simplify right side
    20,890.27x = 393,215,053.11
  5. Step 5: Solve for x
    x = 393,215,053.11/20,890.27
  6. Step 6: Final answer
    x = 18,822.88

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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.