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Finding the Fourth Proportional to 612.60, 920.08 and 381.88

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Solution

The fourth proportional to 612.60, 920.08 and 381.88 is: 573.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.60 : 920.08 = 381.88 : x
  2. Step 2: Convert to fraction form
    612.60/920.08 = 381.88/x
  3. Step 3: Cross multiply
    612.60x = 920.08 × 381.88
  4. Step 4: Simplify right side
    612.60x = 351,360.15
  5. Step 5: Solve for x
    x = 351,360.15/612.60
  6. Step 6: Final answer
    x = 573.56

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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.