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Finding the Fourth Proportional to 612.55, 918.89 and 265.79

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Solution

The fourth proportional to 612.55, 918.89 and 265.79 is: 398.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.55 : 918.89 = 265.79 : x
  2. Step 2: Convert to fraction form
    612.55/918.89 = 265.79/x
  3. Step 3: Cross multiply
    612.55x = 918.89 × 265.79
  4. Step 4: Simplify right side
    612.55x = 244,232.65
  5. Step 5: Solve for x
    x = 244,232.65/612.55
  6. Step 6: Final answer
    x = 398.71

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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.