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Finding the Fourth Proportional to 905.35, 1,358.15 and 288.85

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Solution

The fourth proportional to 905.35, 1,358.15 and 288.85 is: 433.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.35 : 1,358.15 = 288.85 : x
  2. Step 2: Convert to fraction form
    905.35/1,358.15 = 288.85/x
  3. Step 3: Cross multiply
    905.35x = 1,358.15 × 288.85
  4. Step 4: Simplify right side
    905.35x = 392,295.87
  5. Step 5: Solve for x
    x = 392,295.87/905.35
  6. Step 6: Final answer
    x = 433.31

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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.