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Finding the Fourth Proportional to 612.74, 919.40 and 381.57

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Solution

The fourth proportional to 612.74, 919.40 and 381.57 is: 572.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.74 : 919.40 = 381.57 : x
  2. Step 2: Convert to fraction form
    612.74/919.40 = 381.57/x
  3. Step 3: Cross multiply
    612.74x = 919.40 × 381.57
  4. Step 4: Simplify right side
    612.74x = 350,816.41
  5. Step 5: Solve for x
    x = 350,816.41/612.74
  6. Step 6: Final answer
    x = 572.54

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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.