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Finding the Fourth Proportional to 688.58, 950.12 and 389.81

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Solution

The fourth proportional to 688.58, 950.12 and 389.81 is: 537.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.58 : 950.12 = 389.81 : x
  2. Step 2: Convert to fraction form
    688.58/950.12 = 389.81/x
  3. Step 3: Cross multiply
    688.58x = 950.12 × 389.81
  4. Step 4: Simplify right side
    688.58x = 370,365.30
  5. Step 5: Solve for x
    x = 370,365.30/688.58
  6. Step 6: Final answer
    x = 537.87

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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.