Home / 20,886.12-31,330.67-8,406.18

Finding the Fourth Proportional to 20,886.12, 31,330.67 and 8,406.18

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Solution

The fourth proportional to 20,886.12, 31,330.67 and 8,406.18 is: 12,609.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,886.12 : 31,330.67 = 8,406.18 : x
  2. Step 2: Convert to fraction form
    20,886.12/31,330.67 = 8,406.18/x
  3. Step 3: Cross multiply
    20,886.12x = 31,330.67 × 8,406.18
  4. Step 4: Simplify right side
    20,886.12x = 263,371,209.51
  5. Step 5: Solve for x
    x = 263,371,209.51/20,886.12
  6. Step 6: Final answer
    x = 12,609.87

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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.