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Finding the Fourth Proportional to 1,288.60, 1,933.81 and 629.76

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Solution

The fourth proportional to 1,288.60, 1,933.81 and 629.76 is: 945.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,288.60 : 1,933.81 = 629.76 : x
  2. Step 2: Convert to fraction form
    1,288.60/1,933.81 = 629.76/x
  3. Step 3: Cross multiply
    1,288.60x = 1,933.81 × 629.76
  4. Step 4: Simplify right side
    1,288.60x = 1,217,836.19
  5. Step 5: Solve for x
    x = 1,217,836.19/1,288.60
  6. Step 6: Final answer
    x = 945.08

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.