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Finding the Fourth Proportional to 708.21, 1,060.41 and 415.47

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Solution

The fourth proportional to 708.21, 1,060.41 and 415.47 is: 622.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.21 : 1,060.41 = 415.47 : x
  2. Step 2: Convert to fraction form
    708.21/1,060.41 = 415.47/x
  3. Step 3: Cross multiply
    708.21x = 1,060.41 × 415.47
  4. Step 4: Simplify right side
    708.21x = 440,568.54
  5. Step 5: Solve for x
    x = 440,568.54/708.21
  6. Step 6: Final answer
    x = 622.09

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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.