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Finding the Fourth Proportional to 1,136.20, 1,704.48 and 520.12

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Solution

The fourth proportional to 1,136.20, 1,704.48 and 520.12 is: 780.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,136.20 : 1,704.48 = 520.12 : x
  2. Step 2: Convert to fraction form
    1,136.20/1,704.48 = 520.12/x
  3. Step 3: Cross multiply
    1,136.20x = 1,704.48 × 520.12
  4. Step 4: Simplify right side
    1,136.20x = 886,534.14
  5. Step 5: Solve for x
    x = 886,534.14/1,136.20
  6. Step 6: Final answer
    x = 780.26

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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.