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Finding the Fourth Proportional to 758.47, 1,138.14 and 347.56

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Solution

The fourth proportional to 758.47, 1,138.14 and 347.56 is: 521.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    758.47 : 1,138.14 = 347.56 : x
  2. Step 2: Convert to fraction form
    758.47/1,138.14 = 347.56/x
  3. Step 3: Cross multiply
    758.47x = 1,138.14 × 347.56
  4. Step 4: Simplify right side
    758.47x = 395,571.94
  5. Step 5: Solve for x
    x = 395,571.94/758.47
  6. Step 6: Final answer
    x = 521.54

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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.