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Finding the Fourth Proportional to 675.91, 1,015.71 and 351.55

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Solution

The fourth proportional to 675.91, 1,015.71 and 351.55 is: 528.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    675.91 : 1,015.71 = 351.55 : x
  2. Step 2: Convert to fraction form
    675.91/1,015.71 = 351.55/x
  3. Step 3: Cross multiply
    675.91x = 1,015.71 × 351.55
  4. Step 4: Simplify right side
    675.91x = 357,072.85
  5. Step 5: Solve for x
    x = 357,072.85/675.91
  6. Step 6: Final answer
    x = 528.28

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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.