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Finding the Fourth Proportional to 759.49, 1,138.69 and 613.42

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Solution

The fourth proportional to 759.49, 1,138.69 and 613.42 is: 919.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.49 : 1,138.69 = 613.42 : x
  2. Step 2: Convert to fraction form
    759.49/1,138.69 = 613.42/x
  3. Step 3: Cross multiply
    759.49x = 1,138.69 × 613.42
  4. Step 4: Simplify right side
    759.49x = 698,495.22
  5. Step 5: Solve for x
    x = 698,495.22/759.49
  6. Step 6: Final answer
    x = 919.69

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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.