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Finding the Fourth Proportional to 612.17, 918.55 and 381.00

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Solution

The fourth proportional to 612.17, 918.55 and 381.00 is: 571.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.17 : 918.55 = 381.00 : x
  2. Step 2: Convert to fraction form
    612.17/918.55 = 381.00/x
  3. Step 3: Cross multiply
    612.17x = 918.55 × 381.00
  4. Step 4: Simplify right side
    612.17x = 349,961.05
  5. Step 5: Solve for x
    x = 349,961.05/612.17
  6. Step 6: Final answer
    x = 571.68

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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.