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Finding the Fourth Proportional to 673.36, 929.39 and 393.72

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Solution

The fourth proportional to 673.36, 929.39 and 393.72 is: 543.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    673.36 : 929.39 = 393.72 : x
  2. Step 2: Convert to fraction form
    673.36/929.39 = 393.72/x
  3. Step 3: Cross multiply
    673.36x = 929.39 × 393.72
  4. Step 4: Simplify right side
    673.36x = 365,919.43
  5. Step 5: Solve for x
    x = 365,919.43/673.36
  6. Step 6: Final answer
    x = 543.43

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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.