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Finding the Fourth Proportional to 1,720.80, 2,576.16 and 1,289.88

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Solution

The fourth proportional to 1,720.80, 2,576.16 and 1,289.88 is: 1,931.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,720.80 : 2,576.16 = 1,289.88 : x
  2. Step 2: Convert to fraction form
    1,720.80/2,576.16 = 1,289.88/x
  3. Step 3: Cross multiply
    1,720.80x = 2,576.16 × 1,289.88
  4. Step 4: Simplify right side
    1,720.80x = 3,322,937.26
  5. Step 5: Solve for x
    x = 3,322,937.26/1,720.80
  6. Step 6: Final answer
    x = 1,931.04

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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.