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Finding the Fourth Proportional to 688.37, 949.86 and 393.53

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Solution

The fourth proportional to 688.37, 949.86 and 393.53 is: 543.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.37 : 949.86 = 393.53 : x
  2. Step 2: Convert to fraction form
    688.37/949.86 = 393.53/x
  3. Step 3: Cross multiply
    688.37x = 949.86 × 393.53
  4. Step 4: Simplify right side
    688.37x = 373,793.66
  5. Step 5: Solve for x
    x = 373,793.66/688.37
  6. Step 6: Final answer
    x = 543.02

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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.