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Finding the Fourth Proportional to 612.75, 918.52 and 287.54

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Solution

The fourth proportional to 612.75, 918.52 and 287.54 is: 431.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.75 : 918.52 = 287.54 : x
  2. Step 2: Convert to fraction form
    612.75/918.52 = 287.54/x
  3. Step 3: Cross multiply
    612.75x = 918.52 × 287.54
  4. Step 4: Simplify right side
    612.75x = 264,105.93
  5. Step 5: Solve for x
    x = 264,105.93/612.75
  6. Step 6: Final answer
    x = 431.02

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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.