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Finding the Fourth Proportional to 905.12, 1,357.85 and 385.11

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Solution

The fourth proportional to 905.12, 1,357.85 and 385.11 is: 577.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.12 : 1,357.85 = 385.11 : x
  2. Step 2: Convert to fraction form
    905.12/1,357.85 = 385.11/x
  3. Step 3: Cross multiply
    905.12x = 1,357.85 × 385.11
  4. Step 4: Simplify right side
    905.12x = 522,922.58
  5. Step 5: Solve for x
    x = 522,922.58/905.12
  6. Step 6: Final answer
    x = 577.74

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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.