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Finding the Fourth Proportional to 1,290.09, 1,933.92 and 711.75

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Solution

The fourth proportional to 1,290.09, 1,933.92 and 711.75 is: 1,066.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.09 : 1,933.92 = 711.75 : x
  2. Step 2: Convert to fraction form
    1,290.09/1,933.92 = 711.75/x
  3. Step 3: Cross multiply
    1,290.09x = 1,933.92 × 711.75
  4. Step 4: Simplify right side
    1,290.09x = 1,376,467.56
  5. Step 5: Solve for x
    x = 1,376,467.56/1,290.09
  6. Step 6: Final answer
    x = 1,066.95

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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.