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Finding the Fourth Proportional to 612.56, 919.10 and 381.65

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Solution

The fourth proportional to 612.56, 919.10 and 381.65 is: 572.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.56 : 919.10 = 381.65 : x
  2. Step 2: Convert to fraction form
    612.56/919.10 = 381.65/x
  3. Step 3: Cross multiply
    612.56x = 919.10 × 381.65
  4. Step 4: Simplify right side
    612.56x = 350,770.87
  5. Step 5: Solve for x
    x = 350,770.87/612.56
  6. Step 6: Final answer
    x = 572.63

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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.