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Finding the Fourth Proportional to 671.72, 1,005.75 and 551.43

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Solution

The fourth proportional to 671.72, 1,005.75 and 551.43 is: 825.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.72 : 1,005.75 = 551.43 : x
  2. Step 2: Convert to fraction form
    671.72/1,005.75 = 551.43/x
  3. Step 3: Cross multiply
    671.72x = 1,005.75 × 551.43
  4. Step 4: Simplify right side
    671.72x = 554,600.72
  5. Step 5: Solve for x
    x = 554,600.72/671.72
  6. Step 6: Final answer
    x = 825.65

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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.