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Finding the Fourth Proportional to 1,721.72, 2,580.96 and 855.20

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Solution

The fourth proportional to 1,721.72, 2,580.96 and 855.20 is: 1,282.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,721.72 : 2,580.96 = 855.20 : x
  2. Step 2: Convert to fraction form
    1,721.72/2,580.96 = 855.20/x
  3. Step 3: Cross multiply
    1,721.72x = 2,580.96 × 855.20
  4. Step 4: Simplify right side
    1,721.72x = 2,207,236.99
  5. Step 5: Solve for x
    x = 2,207,236.99/1,721.72
  6. Step 6: Final answer
    x = 1,282.00

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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.