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Finding the Fourth Proportional to 993.92, 1,372.20 and 645.26

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Solution

The fourth proportional to 993.92, 1,372.20 and 645.26 is: 890.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.92 : 1,372.20 = 645.26 : x
  2. Step 2: Convert to fraction form
    993.92/1,372.20 = 645.26/x
  3. Step 3: Cross multiply
    993.92x = 1,372.20 × 645.26
  4. Step 4: Simplify right side
    993.92x = 885,425.77
  5. Step 5: Solve for x
    x = 885,425.77/993.92
  6. Step 6: Final answer
    x = 890.84

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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.