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Finding the Fourth Proportional to 455.65, 682.78 and 409.08

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Solution

The fourth proportional to 455.65, 682.78 and 409.08 is: 612.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.65 : 682.78 = 409.08 : x
  2. Step 2: Convert to fraction form
    455.65/682.78 = 409.08/x
  3. Step 3: Cross multiply
    455.65x = 682.78 × 409.08
  4. Step 4: Simplify right side
    455.65x = 279,308.19
  5. Step 5: Solve for x
    x = 279,308.19/455.65
  6. Step 6: Final answer
    x = 612.99

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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.