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Finding the Fourth Proportional to 639.05, 957.75 and 346.55

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Solution

The fourth proportional to 639.05, 957.75 and 346.55 is: 519.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.05 : 957.75 = 346.55 : x
  2. Step 2: Convert to fraction form
    639.05/957.75 = 346.55/x
  3. Step 3: Cross multiply
    639.05x = 957.75 × 346.55
  4. Step 4: Simplify right side
    639.05x = 331,903.47
  5. Step 5: Solve for x
    x = 331,903.47/639.05
  6. Step 6: Final answer
    x = 519.37

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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.