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Finding the Fourth Proportional to 640.34, 881.58 and 551.49

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Solution

The fourth proportional to 640.34, 881.58 and 551.49 is: 759.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.34 : 881.58 = 551.49 : x
  2. Step 2: Convert to fraction form
    640.34/881.58 = 551.49/x
  3. Step 3: Cross multiply
    640.34x = 881.58 × 551.49
  4. Step 4: Simplify right side
    640.34x = 486,182.55
  5. Step 5: Solve for x
    x = 486,182.55/640.34
  6. Step 6: Final answer
    x = 759.26

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.