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Finding the Fourth Proportional to 688.64, 950.44 and 393.90

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Solution

The fourth proportional to 688.64, 950.44 and 393.90 is: 543.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.64 : 950.44 = 393.90 : x
  2. Step 2: Convert to fraction form
    688.64/950.44 = 393.90/x
  3. Step 3: Cross multiply
    688.64x = 950.44 × 393.90
  4. Step 4: Simplify right side
    688.64x = 374,378.32
  5. Step 5: Solve for x
    x = 374,378.32/688.64
  6. Step 6: Final answer
    x = 543.65

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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.