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Finding the Fourth Proportional to 1,093.52, 1,638.60 and 653.90

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Solution

The fourth proportional to 1,093.52, 1,638.60 and 653.90 is: 979.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,093.52 : 1,638.60 = 653.90 : x
  2. Step 2: Convert to fraction form
    1,093.52/1,638.60 = 653.90/x
  3. Step 3: Cross multiply
    1,093.52x = 1,638.60 × 653.90
  4. Step 4: Simplify right side
    1,093.52x = 1,071,480.54
  5. Step 5: Solve for x
    x = 1,071,480.54/1,093.52
  6. Step 6: Final answer
    x = 979.85

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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.