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Finding the Fourth Proportional to 1,982.40, 2,811.12 and 1,982.40

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Solution

The fourth proportional to 1,982.40, 2,811.12 and 1,982.40 is: 2,811.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,982.40 : 2,811.12 = 1,982.40 : x
  2. Step 2: Convert to fraction form
    1,982.40/2,811.12 = 1,982.40/x
  3. Step 3: Cross multiply
    1,982.40x = 2,811.12 × 1,982.40
  4. Step 4: Simplify right side
    1,982.40x = 5,572,764.29
  5. Step 5: Solve for x
    x = 5,572,764.29/1,982.40
  6. Step 6: Final answer
    x = 2,811.12

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.