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Finding the Fourth Proportional to 1,188.73, 1,640.30 and 657.54

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Solution

The fourth proportional to 1,188.73, 1,640.30 and 657.54 is: 907.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,188.73 : 1,640.30 = 657.54 : x
  2. Step 2: Convert to fraction form
    1,188.73/1,640.30 = 657.54/x
  3. Step 3: Cross multiply
    1,188.73x = 1,640.30 × 657.54
  4. Step 4: Simplify right side
    1,188.73x = 1,078,563.27
  5. Step 5: Solve for x
    x = 1,078,563.27/1,188.73
  6. Step 6: Final answer
    x = 907.32

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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.