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Finding the Fourth Proportional to 612.24, 918.54 and 287.79

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Solution

The fourth proportional to 612.24, 918.54 and 287.79 is: 431.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.24 : 918.54 = 287.79 : x
  2. Step 2: Convert to fraction form
    612.24/918.54 = 287.79/x
  3. Step 3: Cross multiply
    612.24x = 918.54 × 287.79
  4. Step 4: Simplify right side
    612.24x = 264,346.63
  5. Step 5: Solve for x
    x = 264,346.63/612.24
  6. Step 6: Final answer
    x = 431.77

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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.