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Finding the Fourth Proportional to 758.87, 1,138.15 and 393.46

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Solution

The fourth proportional to 758.87, 1,138.15 and 393.46 is: 590.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    758.87 : 1,138.15 = 393.46 : x
  2. Step 2: Convert to fraction form
    758.87/1,138.15 = 393.46/x
  3. Step 3: Cross multiply
    758.87x = 1,138.15 × 393.46
  4. Step 4: Simplify right side
    758.87x = 447,814.15
  5. Step 5: Solve for x
    x = 447,814.15/758.87
  6. Step 6: Final answer
    x = 590.11

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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.