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Finding the Fourth Proportional to 613.17, 918.99 and 287.85

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Solution

The fourth proportional to 613.17, 918.99 and 287.85 is: 431.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.17 : 918.99 = 287.85 : x
  2. Step 2: Convert to fraction form
    613.17/918.99 = 287.85/x
  3. Step 3: Cross multiply
    613.17x = 918.99 × 287.85
  4. Step 4: Simplify right side
    613.17x = 264,529.83
  5. Step 5: Solve for x
    x = 264,529.83/613.17
  6. Step 6: Final answer
    x = 431.42

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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.