Home / 20,811.40-31,217.10-19,385.80

Finding the Fourth Proportional to 20,811.40, 31,217.10 and 19,385.80

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Solution

The fourth proportional to 20,811.40, 31,217.10 and 19,385.80 is: 29,078.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,811.40 : 31,217.10 = 19,385.80 : x
  2. Step 2: Convert to fraction form
    20,811.40/31,217.10 = 19,385.80/x
  3. Step 3: Cross multiply
    20,811.40x = 31,217.10 × 19,385.80
  4. Step 4: Simplify right side
    20,811.40x = 605,168,457.18
  5. Step 5: Solve for x
    x = 605,168,457.18/20,811.40
  6. Step 6: Final answer
    x = 29,078.70

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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.