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Finding the Fourth Proportional to 1,682.79, 2,523.66 and 642.03

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Solution

The fourth proportional to 1,682.79, 2,523.66 and 642.03 is: 962.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,682.79 : 2,523.66 = 642.03 : x
  2. Step 2: Convert to fraction form
    1,682.79/2,523.66 = 642.03/x
  3. Step 3: Cross multiply
    1,682.79x = 2,523.66 × 642.03
  4. Step 4: Simplify right side
    1,682.79x = 1,620,265.43
  5. Step 5: Solve for x
    x = 1,620,265.43/1,682.79
  6. Step 6: Final answer
    x = 962.84

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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.