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Finding the Fourth Proportional to 688.35, 949.96 and 393.68

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Solution

The fourth proportional to 688.35, 949.96 and 393.68 is: 543.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.35 : 949.96 = 393.68 : x
  2. Step 2: Convert to fraction form
    688.35/949.96 = 393.68/x
  3. Step 3: Cross multiply
    688.35x = 949.96 × 393.68
  4. Step 4: Simplify right side
    688.35x = 373,980.25
  5. Step 5: Solve for x
    x = 373,980.25/688.35
  6. Step 6: Final answer
    x = 543.30

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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.