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Finding the Fourth Proportional to 688.98, 950.72 and 394.20

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Solution

The fourth proportional to 688.98, 950.72 and 394.20 is: 543.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.98 : 950.72 = 394.20 : x
  2. Step 2: Convert to fraction form
    688.98/950.72 = 394.20/x
  3. Step 3: Cross multiply
    688.98x = 950.72 × 394.20
  4. Step 4: Simplify right side
    688.98x = 374,773.82
  5. Step 5: Solve for x
    x = 374,773.82/688.98
  6. Step 6: Final answer
    x = 543.95

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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.