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Finding the Fourth Proportional to 905.02, 1,357.73 and 280.32

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Solution

The fourth proportional to 905.02, 1,357.73 and 280.32 is: 420.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.02 : 1,357.73 = 280.32 : x
  2. Step 2: Convert to fraction form
    905.02/1,357.73 = 280.32/x
  3. Step 3: Cross multiply
    905.02x = 1,357.73 × 280.32
  4. Step 4: Simplify right side
    905.02x = 380,598.87
  5. Step 5: Solve for x
    x = 380,598.87/905.02
  6. Step 6: Final answer
    x = 420.54

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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.