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Finding the Fourth Proportional to 905.05, 1,357.39 and 255.63

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Solution

The fourth proportional to 905.05, 1,357.39 and 255.63 is: 383.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.05 : 1,357.39 = 255.63 : x
  2. Step 2: Convert to fraction form
    905.05/1,357.39 = 255.63/x
  3. Step 3: Cross multiply
    905.05x = 1,357.39 × 255.63
  4. Step 4: Simplify right side
    905.05x = 346,989.61
  5. Step 5: Solve for x
    x = 346,989.61/905.05
  6. Step 6: Final answer
    x = 383.39

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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.