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Finding the Fourth Proportional to 627.92, 945.55 and 551.72

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Solution

The fourth proportional to 627.92, 945.55 and 551.72 is: 830.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.92 : 945.55 = 551.72 : x
  2. Step 2: Convert to fraction form
    627.92/945.55 = 551.72/x
  3. Step 3: Cross multiply
    627.92x = 945.55 × 551.72
  4. Step 4: Simplify right side
    627.92x = 521,678.85
  5. Step 5: Solve for x
    x = 521,678.85/627.92
  6. Step 6: Final answer
    x = 830.80

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.