Home / 20,885.65-31,344.04-8,405.78

Finding the Fourth Proportional to 20,885.65, 31,344.04 and 8,405.78

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Solution

The fourth proportional to 20,885.65, 31,344.04 and 8,405.78 is: 12,614.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,885.65 : 31,344.04 = 8,405.78 : x
  2. Step 2: Convert to fraction form
    20,885.65/31,344.04 = 8,405.78/x
  3. Step 3: Cross multiply
    20,885.65x = 31,344.04 × 8,405.78
  4. Step 4: Simplify right side
    20,885.65x = 263,470,926.82
  5. Step 5: Solve for x
    x = 263,470,926.82/20,885.65
  6. Step 6: Final answer
    x = 12,614.93

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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.