Home / 20,722.80-31,084.20-12,412.20

Finding the Fourth Proportional to 20,722.80, 31,084.20 and 12,412.20

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Solution

The fourth proportional to 20,722.80, 31,084.20 and 12,412.20 is: 18,618.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,722.80 : 31,084.20 = 12,412.20 : x
  2. Step 2: Convert to fraction form
    20,722.80/31,084.20 = 12,412.20/x
  3. Step 3: Cross multiply
    20,722.80x = 31,084.20 × 12,412.20
  4. Step 4: Simplify right side
    20,722.80x = 385,823,307.24
  5. Step 5: Solve for x
    x = 385,823,307.24/20,722.80
  6. Step 6: Final answer
    x = 18,618.30

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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.