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Finding the Fourth Proportional to 905.28, 1,357.80 and 385.08

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Solution

The fourth proportional to 905.28, 1,357.80 and 385.08 is: 577.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.28 : 1,357.80 = 385.08 : x
  2. Step 2: Convert to fraction form
    905.28/1,357.80 = 385.08/x
  3. Step 3: Cross multiply
    905.28x = 1,357.80 × 385.08
  4. Step 4: Simplify right side
    905.28x = 522,861.62
  5. Step 5: Solve for x
    x = 522,861.62/905.28
  6. Step 6: Final answer
    x = 577.57

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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.