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Finding the Fourth Proportional to 1,808.40, 2,712.20 and 1,720.65

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Solution

The fourth proportional to 1,808.40, 2,712.20 and 1,720.65 is: 2,580.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,808.40 : 2,712.20 = 1,720.65 : x
  2. Step 2: Convert to fraction form
    1,808.40/2,712.20 = 1,720.65/x
  3. Step 3: Cross multiply
    1,808.40x = 2,712.20 × 1,720.65
  4. Step 4: Simplify right side
    1,808.40x = 4,666,738.33
  5. Step 5: Solve for x
    x = 4,666,738.33/1,808.40
  6. Step 6: Final answer
    x = 2,580.59

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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.