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Finding the Fourth Proportional to 759.15, 1,137.71 and 347.87

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Solution

The fourth proportional to 759.15, 1,137.71 and 347.87 is: 521.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.15 : 1,137.71 = 347.87 : x
  2. Step 2: Convert to fraction form
    759.15/1,137.71 = 347.87/x
  3. Step 3: Cross multiply
    759.15x = 1,137.71 × 347.87
  4. Step 4: Simplify right side
    759.15x = 395,775.18
  5. Step 5: Solve for x
    x = 395,775.18/759.15
  6. Step 6: Final answer
    x = 521.34

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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.