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Finding the Fourth Proportional to 905.90, 1,358.56 and 385.89

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Solution

The fourth proportional to 905.90, 1,358.56 and 385.89 is: 578.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.90 : 1,358.56 = 385.89 : x
  2. Step 2: Convert to fraction form
    905.90/1,358.56 = 385.89/x
  3. Step 3: Cross multiply
    905.90x = 1,358.56 × 385.89
  4. Step 4: Simplify right side
    905.90x = 524,252.79
  5. Step 5: Solve for x
    x = 524,252.79/905.90
  6. Step 6: Final answer
    x = 578.71

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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.