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Finding the Fourth Proportional to 611.34, 918.12 and 380.69

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Solution

The fourth proportional to 611.34, 918.12 and 380.69 is: 571.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.34 : 918.12 = 380.69 : x
  2. Step 2: Convert to fraction form
    611.34/918.12 = 380.69/x
  3. Step 3: Cross multiply
    611.34x = 918.12 × 380.69
  4. Step 4: Simplify right side
    611.34x = 349,519.10
  5. Step 5: Solve for x
    x = 349,519.10/611.34
  6. Step 6: Final answer
    x = 571.73

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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.