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Finding the Fourth Proportional to 905.10, 1,356.54 and 515.42

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Solution

The fourth proportional to 905.10, 1,356.54 and 515.42 is: 772.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.10 : 1,356.54 = 515.42 : x
  2. Step 2: Convert to fraction form
    905.10/1,356.54 = 515.42/x
  3. Step 3: Cross multiply
    905.10x = 1,356.54 × 515.42
  4. Step 4: Simplify right side
    905.10x = 699,187.85
  5. Step 5: Solve for x
    x = 699,187.85/905.10
  6. Step 6: Final answer
    x = 772.50

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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.