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Finding the Fourth Proportional to 993.96, 1,372.20 and 679.68

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Solution

The fourth proportional to 993.96, 1,372.20 and 679.68 is: 938.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.96 : 1,372.20 = 679.68 : x
  2. Step 2: Convert to fraction form
    993.96/1,372.20 = 679.68/x
  3. Step 3: Cross multiply
    993.96x = 1,372.20 × 679.68
  4. Step 4: Simplify right side
    993.96x = 932,656.90
  5. Step 5: Solve for x
    x = 932,656.90/993.96
  6. Step 6: Final answer
    x = 938.32

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Half scale
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Double scale
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1.5x scale

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.