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Finding the Fourth Proportional to 1,682.96, 2,525.17 and 643.28

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Solution

The fourth proportional to 1,682.96, 2,525.17 and 643.28 is: 965.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,682.96 : 2,525.17 = 643.28 : x
  2. Step 2: Convert to fraction form
    1,682.96/2,525.17 = 643.28/x
  3. Step 3: Cross multiply
    1,682.96x = 2,525.17 × 643.28
  4. Step 4: Simplify right side
    1,682.96x = 1,624,391.36
  5. Step 5: Solve for x
    x = 1,624,391.36/1,682.96
  6. Step 6: Final answer
    x = 965.20

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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.