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Finding the Fourth Proportional to 688.40, 1,033.20 and 551.60

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Solution

The fourth proportional to 688.40, 1,033.20 and 551.60 is: 827.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.40 : 1,033.20 = 551.60 : x
  2. Step 2: Convert to fraction form
    688.40/1,033.20 = 551.60/x
  3. Step 3: Cross multiply
    688.40x = 1,033.20 × 551.60
  4. Step 4: Simplify right side
    688.40x = 569,913.12
  5. Step 5: Solve for x
    x = 569,913.12/688.40
  6. Step 6: Final answer
    x = 827.88

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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.