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Finding the Fourth Proportional to 1,288.75, 1,933.20 and 364.38

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Solution

The fourth proportional to 1,288.75, 1,933.20 and 364.38 is: 546.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,288.75 : 1,933.20 = 364.38 : x
  2. Step 2: Convert to fraction form
    1,288.75/1,933.20 = 364.38/x
  3. Step 3: Cross multiply
    1,288.75x = 1,933.20 × 364.38
  4. Step 4: Simplify right side
    1,288.75x = 704,419.42
  5. Step 5: Solve for x
    x = 704,419.42/1,288.75
  6. Step 6: Final answer
    x = 546.59

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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.