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Finding the Fourth Proportional to 611.89, 918.18 and 265.48

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Solution

The fourth proportional to 611.89, 918.18 and 265.48 is: 398.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.89 : 918.18 = 265.48 : x
  2. Step 2: Convert to fraction form
    611.89/918.18 = 265.48/x
  3. Step 3: Cross multiply
    611.89x = 918.18 × 265.48
  4. Step 4: Simplify right side
    611.89x = 243,758.43
  5. Step 5: Solve for x
    x = 243,758.43/611.89
  6. Step 6: Final answer
    x = 398.37

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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.