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Finding the Fourth Proportional to 1,328.91, 1,991.75 and 506.63

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Solution

The fourth proportional to 1,328.91, 1,991.75 and 506.63 is: 759.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,328.91 : 1,991.75 = 506.63 : x
  2. Step 2: Convert to fraction form
    1,328.91/1,991.75 = 506.63/x
  3. Step 3: Cross multiply
    1,328.91x = 1,991.75 × 506.63
  4. Step 4: Simplify right side
    1,328.91x = 1,009,067.81
  5. Step 5: Solve for x
    x = 1,009,067.81/1,328.91
  6. Step 6: Final answer
    x = 759.32

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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.