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Finding the Fourth Proportional to 688.88, 951.72 and 640.28

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Solution

The fourth proportional to 688.88, 951.72 and 640.28 is: 884.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.88 : 951.72 = 640.28 : x
  2. Step 2: Convert to fraction form
    688.88/951.72 = 640.28/x
  3. Step 3: Cross multiply
    688.88x = 951.72 × 640.28
  4. Step 4: Simplify right side
    688.88x = 609,367.28
  5. Step 5: Solve for x
    x = 609,367.28/688.88
  6. Step 6: Final answer
    x = 884.58

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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.