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Finding the Fourth Proportional to 759.62, 1,138.70 and 389.43

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Solution

The fourth proportional to 759.62, 1,138.70 and 389.43 is: 583.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.62 : 1,138.70 = 389.43 : x
  2. Step 2: Convert to fraction form
    759.62/1,138.70 = 389.43/x
  3. Step 3: Cross multiply
    759.62x = 1,138.70 × 389.43
  4. Step 4: Simplify right side
    759.62x = 443,444.91
  5. Step 5: Solve for x
    x = 443,444.91/759.62
  6. Step 6: Final answer
    x = 583.77

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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.