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Finding the Fourth Proportional to 688.80, 1,027.86 and 627.48

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Solution

The fourth proportional to 688.80, 1,027.86 and 627.48 is: 936.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.80 : 1,027.86 = 627.48 : x
  2. Step 2: Convert to fraction form
    688.80/1,027.86 = 627.48/x
  3. Step 3: Cross multiply
    688.80x = 1,027.86 × 627.48
  4. Step 4: Simplify right side
    688.80x = 644,961.59
  5. Step 5: Solve for x
    x = 644,961.59/688.80
  6. Step 6: Final answer
    x = 936.36

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.