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Finding the Fourth Proportional to 1,089.77, 1,633.75 and 505.20

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Solution

The fourth proportional to 1,089.77, 1,633.75 and 505.20 is: 757.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,089.77 : 1,633.75 = 505.20 : x
  2. Step 2: Convert to fraction form
    1,089.77/1,633.75 = 505.20/x
  3. Step 3: Cross multiply
    1,089.77x = 1,633.75 × 505.20
  4. Step 4: Simplify right side
    1,089.77x = 825,364.42
  5. Step 5: Solve for x
    x = 825,364.42/1,089.77
  6. Step 6: Final answer
    x = 757.37

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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.