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Finding the Fourth Proportional to 612.80, 918.48 and 304.56

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Solution

The fourth proportional to 612.80, 918.48 and 304.56 is: 456.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.80 : 918.48 = 304.56 : x
  2. Step 2: Convert to fraction form
    612.80/918.48 = 304.56/x
  3. Step 3: Cross multiply
    612.80x = 918.48 × 304.56
  4. Step 4: Simplify right side
    612.80x = 279,732.27
  5. Step 5: Solve for x
    x = 279,732.27/612.80
  6. Step 6: Final answer
    x = 456.48

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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.