Home / 20,665.40-30,998.10-12,354.80

Finding the Fourth Proportional to 20,665.40, 30,998.10 and 12,354.80

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Solution

The fourth proportional to 20,665.40, 30,998.10 and 12,354.80 is: 18,532.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,665.40 : 30,998.10 = 12,354.80 : x
  2. Step 2: Convert to fraction form
    20,665.40/30,998.10 = 12,354.80/x
  3. Step 3: Cross multiply
    20,665.40x = 30,998.10 × 12,354.80
  4. Step 4: Simplify right side
    20,665.40x = 382,975,325.88
  5. Step 5: Solve for x
    x = 382,975,325.88/20,665.40
  6. Step 6: Final answer
    x = 18,532.20

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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.